-
1
-
-
84866136229
-
Lead Iodide Perovskite Sensitized All-Solid-State Submicron Thin Film Mesoscopic Solar Cell with Efficiency Exceeding 9%
-
Kim, H. S.; Lee, C. R.; Im, J. H.; Lee, K. B.; Moehl, T.; Marchioro, A.; Moon, S. J.; Humphry-Baker, R.; Yum, J. H.; Moser, J. E.; Gratzel, M.; Park, N. G. Lead Iodide Perovskite Sensitized All-Solid-State Submicron Thin Film Mesoscopic Solar Cell with Efficiency Exceeding 9% Sci. Rep. 2012, 2 (591) 1-7
-
(2012)
Sci. Rep.
, vol.2
, Issue.591
, pp. 1-7
-
-
Kim, H.S.1
Lee, C.R.2
Im, J.H.3
Lee, K.B.4
Moehl, T.5
Marchioro, A.6
Moon, S.J.7
Humphry-Baker, R.8
Yum, J.H.9
Moser, J.E.10
Gratzel, M.11
Park, N.G.12
-
2
-
-
80053595325
-
6.5% Efficient Perovskite Quantum-Dot-Sensitized Solar Cell
-
Im, J.-H.; Lee, C.-R.; Lee, J.-W.; Park, S.-W.; Park, N.-G. 6.5% Efficient Perovskite Quantum-Dot-Sensitized Solar Cell Nanoscale 2011, 3, 4088-4093
-
(2011)
Nanoscale
, vol.3
, pp. 4088-4093
-
-
Im, J.-H.1
Lee, C.-R.2
Lee, J.-W.3
Park, S.-W.4
Park, N.-G.5
-
3
-
-
84897879784
-
Organolead Halide Perovskite: New Horizons in Solar Cell Research
-
Kim, H. S.; Im, S. H.; Park, N. G. Organolead Halide Perovskite: New Horizons in Solar Cell Research J. Phys. Chem. C 2014, 118, 5615-5625
-
(2014)
J. Phys. Chem. C
, vol.118
, pp. 5615-5625
-
-
Kim, H.S.1
Im, S.H.2
Park, N.G.3
-
4
-
-
84885692931
-
Electron-Hole Diffusion Lengths Exceeding 1 Micrometer in an Organometal Trihalide Perovskite Absorber
-
Stranks, S. D.; Eperon, G. E.; Grancini, G.; Menelaou, C.; Alcocer, M. J. P.; Leijtens, T.; Herz, L. M.; Petrozza, A.; Snaith, H. J. Electron-Hole Diffusion Lengths Exceeding 1 Micrometer in an Organometal Trihalide Perovskite Absorber Science 2013, 342, 341-344
-
(2013)
Science
, vol.342
, pp. 341-344
-
-
Stranks, S.D.1
Eperon, G.E.2
Grancini, G.3
Menelaou, C.4
Alcocer, M.J.P.5
Leijtens, T.6
Herz, L.M.7
Petrozza, A.8
Snaith, H.J.9
-
5
-
-
84885817313
-
3
-
3 Science 2013, 342, 344-347
-
(2013)
Science
, vol.342
, pp. 344-347
-
-
Xing, G.1
Mathews, N.2
Sun, S.3
Lim, S.S.4
Lam, Y.M.5
Gratzel, M.6
Mhaisalkar, S.7
Sum, T.C.8
-
6
-
-
84878745339
-
Efficient Inorganic-organic Hybrid Heterojunction Solar Cells Containing Perovskite Compound and Polymeric Hole Conductors
-
Heo, J. H.; Im, S. H.; Noh, J. H.; Mandal, T. N.; Lim, C. S.; Chang, J. A.; Lee, Y. H.; Kim, H. J.; Sarkar, A.; Nazeeruddin, M. K.; Gratzel, M.; Seok, S. I. Efficient Inorganic-organic Hybrid Heterojunction Solar Cells Containing Perovskite Compound and Polymeric Hole Conductors Nat. Photonics 2013, 7, 487-492
-
(2013)
Nat. Photonics
, vol.7
, pp. 487-492
-
-
Heo, J.H.1
Im, S.H.2
Noh, J.H.3
Mandal, T.N.4
Lim, C.S.5
Chang, J.A.6
Lee, Y.H.7
Kim, H.J.8
Sarkar, A.9
Nazeeruddin, M.K.10
Gratzel, M.11
Seok, S.I.12
-
7
-
-
84880507645
-
Sequential Deposition as a Route to High-Performance Perovskite-Sensitized Solar Cells
-
Burschka, J.; Pellet, N.; Moon, S. J.; Humphry-Baker, R.; Gao, P.; Nazeeruddin, M. K.; Gratzel, M. Sequential Deposition as a Route to High-Performance Perovskite-Sensitized Solar Cells Nature 2013, 499, 316-319
-
(2013)
Nature
, vol.499
, pp. 316-319
-
-
Burschka, J.1
Pellet, N.2
Moon, S.J.3
Humphry-Baker, R.4
Gao, P.5
Nazeeruddin, M.K.6
Gratzel, M.7
-
8
-
-
84884411335
-
Efficient Planar Heterojunction Perovskite Solar Cells by Vapour Deposition
-
Liu, M.; Johnston, M. B.; Snaith, H. J. Efficient Planar Heterojunction Perovskite Solar Cells by Vapour Deposition Nature 2013, 501, 395-398
-
(2013)
Nature
, vol.501
, pp. 395-398
-
-
Liu, M.1
Johnston, M.B.2
Snaith, H.J.3
-
9
-
-
84893299607
-
Perovskite Solar Cells with a Planar Heterojunction Structure Prepared Using Room-Temperature Solution Processing Techniques
-
Liu, D.; Kelly, T. L. Perovskite Solar Cells With a Planar Heterojunction Structure Prepared Using Room-Temperature Solution Processing Techniques Nat. Photonics 2013, 8, 133-138
-
(2013)
Nat. Photonics
, vol.8
, pp. 133-138
-
-
Liu, D.1
Kelly, T.L.2
-
10
-
-
84893249935
-
Perovskite Solar Cells Employing Organic Charge-Transport Layers
-
Malinkiewicz, O.; Yella, A.; Lee, Y. H.; Espallargas, G. M.; Graetzel, M.; Nazeeruddin, M. K.; Bolink, H. J. Perovskite Solar Cells Employing Organic Charge-Transport Layers Nat. Photonics 2014, 8, 128-132
-
(2014)
Nat. Photonics
, vol.8
, pp. 128-132
-
-
Malinkiewicz, O.1
Yella, A.2
Lee, Y.H.3
Espallargas, G.M.4
Graetzel, M.5
Nazeeruddin, M.K.6
Bolink, H.J.7
-
11
-
-
70149102912
-
Organometal Halide Perovskites as Visible-Light Sensitizers for Photovoltaic Cells
-
Kojima, A.; Teshima, K.; Shirai, Y.; Miyasaka, T. Organometal Halide Perovskites as Visible-Light Sensitizers for Photovoltaic Cells J. Am. Chem. Soc. 2009, 131, 6050-6051
-
(2009)
J. Am. Chem. Soc.
, vol.131
, pp. 6050-6051
-
-
Kojima, A.1
Teshima, K.2
Shirai, Y.3
Miyasaka, T.4
-
12
-
-
84894176777
-
2 Nanocomposites in Thin Film Perovskite Solar Cells
-
2 Nanocomposites in Thin Film Perovskite Solar Cells Nano Lett. 2014, 14, 724-730
-
(2014)
Nano Lett.
, vol.14
, pp. 724-730
-
-
Wang, J.T.1
Ball, J.M.2
Barea, E.M.3
Abate, A.4
Alexander-Webber, J.A.5
Huang, J.6
Saliba, M.7
Mora-Sero, I.8
Bisquert, J.9
Snaith, H.J.10
Nicholas, R.J.11
-
13
-
-
84902239388
-
Supramolecular Halogen Bond Passivation of Organic-Inorganic Halide Perovskite Solar Cells
-
Abate, A.; Saliba, M.; Hollman, D. J.; Stranks, S. D.; Wojciechowski, K.; Avolio, R.; Grancini, G.; Petrozza, A.; Snaith, H. J. Supramolecular Halogen Bond Passivation of Organic-Inorganic Halide Perovskite Solar Cells Nano Lett. 2014, 14, 3247-3254
-
(2014)
Nano Lett.
, vol.14
, pp. 3247-3254
-
-
Abate, A.1
Saliba, M.2
Hollman, D.J.3
Stranks, S.D.4
Wojciechowski, K.5
Avolio, R.6
Grancini, G.7
Petrozza, A.8
Snaith, H.J.9
-
14
-
-
84897642206
-
Sub 150 °c Processed Meso-Superstructured Perovskite Solar Cells with Enhanced Efficiency
-
Wojciechowski, K.; Saliba, M.; Leijtens, T.; Abate, A.; Snaith, H. Sub 150 °C Processed Meso-Superstructured Perovskite Solar Cells with Enhanced Efficiency Energy Environ. Sci. 2013, 7, 1142-1147
-
(2013)
Energy Environ. Sci.
, vol.7
, pp. 1142-1147
-
-
Wojciechowski, K.1
Saliba, M.2
Leijtens, T.3
Abate, A.4
Snaith, H.5
-
16
-
-
84901952541
-
O -Methoxy Substituents in Spiro-OMeTAD for Efficient Inorganic-Organic Hybrid Perovskite Solar Cells
-
Jeon, N. J.; Lee, H. G.; Kim, Y. C.; Seo, J.; Noh, J. H.; Lee, J.; Seok, S. I. o -Methoxy Substituents in Spiro-OMeTAD for Efficient Inorganic-Organic Hybrid Perovskite Solar Cells J. Am. Chem. Soc. 2014, 136, 7837-7840
-
(2014)
J. Am. Chem. Soc.
, vol.136
, pp. 7837-7840
-
-
Jeon, N.J.1
Lee, H.G.2
Kim, Y.C.3
Seo, J.4
Noh, J.H.5
Lee, J.6
Seok, S.I.7
-
17
-
-
84928951451
-
Solvent Engineering for High-performance Inorganic-Organic Hybrid Perovskite Solar Cells
-
Jeon, N. J.; Noh, J. H.; Kim, Y. C.; Yang, W. S.; Ryu, S.; Seok, S. I. Solvent Engineering for High-performance Inorganic-Organic Hybrid Perovskite Solar Cells Nat. Mater. 2014, 13, 897-903
-
(2014)
Nat. Mater.
, vol.13
, pp. 897-903
-
-
Jeon, N.J.1
Noh, J.H.2
Kim, Y.C.3
Yang, W.S.4
Ryu, S.5
Seok, S.I.6
-
18
-
-
84905902495
-
Interface Engineering of Highly Efficient Perovskite Solar Cells
-
Zhou, H.; Chen, Q.; Li, G.; Luo, S.; Song, T. b.; Duan, H. S.; Hong, Z.; You, J.; Liu, Y.; Yang, Y. Interface Engineering of Highly Efficient Perovskite Solar Cells Science 2014, 345, 542-546
-
(2014)
Science
, vol.345
, pp. 542-546
-
-
Zhou, H.1
Chen, Q.2
Li, G.3
Luo, S.4
Song, T.B.5
Duan, H.S.6
Hong, Z.7
You, J.8
Liu, Y.9
Yang, Y.10
-
19
-
-
84868195671
-
Efficient Hybrid Solar Cells Based on Meso-Superstructured Organometal Halide Perovskites
-
Lee, M. M.; Teuscher, J.; Miyasaka, T.; Murakami, T. N.; Snaith, H. J. Efficient Hybrid Solar Cells Based on Meso-Superstructured Organometal Halide Perovskites Science 2012, 338, 643-647
-
(2012)
Science
, vol.338
, pp. 643-647
-
-
Lee, M.M.1
Teuscher, J.2
Miyasaka, T.3
Murakami, T.N.4
Snaith, H.J.5
-
20
-
-
84880157688
-
3 Perovskite/Fullerene Planar-Heterojunction Hybrid Solar Cells
-
3 Perovskite/Fullerene Planar-Heterojunction Hybrid Solar Cells Adv. Mater. 2013, 25, 3727-3732
-
(2013)
Adv. Mater.
, vol.25
, pp. 3727-3732
-
-
Jeng, J.Y.1
Chiang, Y.F.2
Lee, M.H.3
Peng, S.R.4
Guo, T.F.5
Chen, P.6
Wen, T.C.7
-
21
-
-
84887725438
-
Efficient Organometal Trihalide Perovskite Planar-Heterojunction Solar Cells on Flexible Polymer Substrates
-
Docampo, P.; Ball, J. M.; Darwich, M.; Eperon, G. E.; Snaith, H. J. Efficient Organometal Trihalide Perovskite Planar-Heterojunction Solar Cells on Flexible Polymer Substrates Nat. commun. 2013, 4, 2761
-
(2013)
Nat. Commun.
, vol.4
, pp. 2761
-
-
Docampo, P.1
Ball, J.M.2
Darwich, M.3
Eperon, G.E.4
Snaith, H.J.5
-
22
-
-
84890490428
-
The Origin of High Efficiency in Low-Temperature Solution-Processable Bilayer Organometal Halide Hybrid Solar Cells
-
Sun, S.; Salim, T.; Mathews, N.; Duchamp, M.; Boothroyd, C.; Xing, G.; Sum, T. C.; Lam, Y.-M. The Origin of High Efficiency in Low-Temperature Solution-Processable Bilayer Organometal Halide Hybrid Solar Cells Energy Environ. Sci. 2013, 7, 399-407
-
(2013)
Energy Environ. Sci.
, vol.7
, pp. 399-407
-
-
Sun, S.1
Salim, T.2
Mathews, N.3
Duchamp, M.4
Boothroyd, C.5
Xing, G.6
Sum, T.C.7
Lam, Y.-M.8
-
23
-
-
84904541404
-
Benefits of Very Thin PCBM and LiF Layer for Solution-Processed P-I-N Perovskite Solar Cells
-
Seo, J. W.; Park, S.; Kim, Y. C.; Jeon, N. J.; Noh, J. H.; Yoon, S. C.; Seok, S. I. Benefits of Very Thin PCBM and LiF Layer for Solution-Processed P-I-N Perovskite Solar Cells Energy Environ. Sci. 2014, 7, 2642-2646
-
(2014)
Energy Environ. Sci.
, vol.7
, pp. 2642-2646
-
-
Seo, J.W.1
Park, S.2
Kim, Y.C.3
Jeon, N.J.4
Noh, J.H.5
Yoon, S.C.6
Seok, S.I.7
-
24
-
-
84902125882
-
Additive Enhanced Crystallization of Solution-Processed Perovskite for Highly Efficient Planar-Heterojunction Solar Cells
-
Liang, P.-W.; Liao, C.-Y.; Chueh, C.-C.; Zuo, F.; Williams, S. T.; Xin, X.-K.; Lin, J.; Jen, A. K. Y. Additive Enhanced Crystallization of Solution-Processed Perovskite for Highly Efficient Planar-Heterojunction Solar Cells Adv. Mater. 2014, 26, 3748-3754
-
(2014)
Adv. Mater.
, vol.26
, pp. 3748-3754
-
-
Liang, P.-W.1
Liao, C.-Y.2
Chueh, C.-C.3
Zuo, F.4
Williams, S.T.5
Xin, X.-K.6
Lin, J.7
Jen, A.K.Y.8
-
25
-
-
84905845476
-
An 80.11% FF Record Achieved for Perovskite Solar Cells by Using the NHCl Additive
-
Zuo, C.; Ding, L. An 80.11% FF Record Achieved for Perovskite Solar Cells by Using the NHCl Additive Nanoscale 2014, 6, 9935-9938
-
(2014)
Nanoscale
, vol.6
, pp. 9935-9938
-
-
Zuo, C.1
Ding, L.2
-
26
-
-
84901767675
-
Mixed Solvents for the Optimization of Morphology in Solution-Processed, Inverted-type Perovskite/Fullerene Hybrid Solar Cells
-
Kim, H.-B.; Choi, H.; Jeong, J.; Kim, S.; Walker, B.; Song, S.; Kim, J. Y. Mixed Solvents for the Optimization of Morphology in Solution-Processed, Inverted-type Perovskite/Fullerene Hybrid Solar Cells Nanoscale 2014, 6, 6679-6683
-
(2014)
Nanoscale
, vol.6
, pp. 6679-6683
-
-
Kim, H.-B.1
Choi, H.2
Jeong, J.3
Kim, S.4
Walker, B.5
Song, S.6
Kim, J.Y.7
-
27
-
-
84905845478
-
Two-Step Thermal Annealing Improves the Morphology of Spin-Coated Films for Highly Efficient Perovskite Hybrid Photovoltaics
-
Hsu, H. L.; Chen, C. P.; Chang, J. Y.; Yu, Y. Y.; Shen, Y. K. Two-Step Thermal Annealing Improves the Morphology of Spin-Coated Films for Highly Efficient Perovskite Hybrid Photovoltaics Nanoscale 2014, 6, 10281-10288
-
(2014)
Nanoscale
, vol.6
, pp. 10281-10288
-
-
Hsu, H.L.1
Chen, C.P.2
Chang, J.Y.3
Yu, Y.Y.4
Shen, Y.K.5
-
28
-
-
84906220253
-
Efficient Planar Heterojunction Mixed-Halide Perovskite Solar Cells Deposited via Spray-Deposition
-
Barrows, A.; Pearson, A.; Kwak, C.; Dunbar, A.; Buckley, A.; Lidzey, D. Efficient Planar Heterojunction Mixed-Halide Perovskite Solar Cells Deposited via Spray-Deposition Energy Environ. Sci. 2014, 7, 2944-2950
-
(2014)
Energy Environ. Sci.
, vol.7
, pp. 2944-2950
-
-
Barrows, A.1
Pearson, A.2
Kwak, C.3
Dunbar, A.4
Buckley, A.5
Lidzey, D.6
-
29
-
-
84904573040
-
Efficient, High-Yield Perovskite Photovoltaic Devices Grown by Interdiffusion of Solution-Processed Precursor Stacking Layers
-
Xiao, Z.; Bi, C.; Shao, Y.; Dong, Q.; Wang, Q.; Yuan, Y.; Wang, C.; Gao, Y.; Huang, J. Efficient, High-Yield Perovskite Photovoltaic Devices Grown by Interdiffusion of Solution-Processed Precursor Stacking Layers Energy Environ. Sci. 2014, 7, 2619
-
(2014)
Energy Environ. Sci.
, vol.7
, pp. 2619
-
-
Xiao, Z.1
Bi, C.2
Shao, Y.3
Dong, Q.4
Wang, Q.5
Yuan, Y.6
Wang, C.7
Gao, Y.8
Huang, J.9
-
30
-
-
84907148390
-
Planar Heterojunction Perovskite/PC71BM Solar Cells with Enhanced Open-Circuit Voltage via a (2/1)-Step Spin-Coating Process
-
Chiang, C. H.; Tseng, Z. L.; Wu, C. G. Planar Heterojunction Perovskite/PC71BM Solar Cells with Enhanced Open-Circuit Voltage via a (2/1)-Step Spin-Coating Process J. Mater. Chem. A 2014, 2, 15897-15903
-
(2014)
J. Mater. Chem. A
, vol.2
, pp. 15897-15903
-
-
Chiang, C.H.1
Tseng, Z.L.2
Wu, C.G.3
-
31
-
-
59649111119
-
A High-Mobility Electron-Transporting Polymer for Printed Transistors
-
Yan, H.; Chen, Z.; Zheng, Y.; Newman, C.; Quinn, J. R.; Dotz, F.; Kastler, M.; Facchetti, A. A High-Mobility Electron-Transporting Polymer for Printed Transistors Nature 2009, 457, 679-686
-
(2009)
Nature
, vol.457
, pp. 679-686
-
-
Yan, H.1
Chen, Z.2
Zheng, Y.3
Newman, C.4
Quinn, J.R.5
Dotz, F.6
Kastler, M.7
Facchetti, A.8
-
32
-
-
67749108292
-
Naphthalenedicarboximide- vs Perylenedicarboximide-Based Copolymers. Synthesis and Semiconducting Properties in Bottom-Gate N-Channel Organic Transistors
-
Chen, Z.; Zheng, Y.; Yan, H.; Facchetti, A. Naphthalenedicarboximide- vs Perylenedicarboximide-Based Copolymers. Synthesis and Semiconducting Properties in Bottom-Gate N-Channel Organic Transistors J. Am. Chem. Soc. 2008, 131, 8-9
-
(2008)
J. Am. Chem. Soc.
, vol.131
, pp. 8-9
-
-
Chen, Z.1
Zheng, Y.2
Yan, H.3
Facchetti, A.4
-
33
-
-
84884825975
-
Naphthalenediimide-Based Copolymers Incorporating Vinyl-Linkages for High-Performance Ambipolar Field-Effect Transistors and Complementary-Like Inverters under Air
-
Chen, H.; Guo, Y.; Mao, Z.; Yu, G.; Huang, J.; Zhao, Y.; Liu, Y. Naphthalenediimide-Based Copolymers Incorporating Vinyl-Linkages for High-Performance Ambipolar Field-Effect Transistors and Complementary-Like Inverters under Air Chem. Mater. 2013, 25, 3589-3596
-
(2013)
Chem. Mater.
, vol.25
, pp. 3589-3596
-
-
Chen, H.1
Guo, Y.2
Mao, Z.3
Yu, G.4
Huang, J.5
Zhao, Y.6
Liu, Y.7
-
34
-
-
84894431028
-
Synthesis, Electronic Structure, and Charge Transport Characteristics of Naphthalenediimide-Based Co-Polymers with Different Oligothiophene Donor Units
-
Luzio, A.; Fazzi, D.; Natali, D.; Giussani, E.; Baeg, K.-J.; Chen, Z.; Noh, Y.-Y.; Facchetti, A.; Caironi, M. Synthesis, Electronic Structure, and Charge Transport Characteristics of Naphthalenediimide-Based Co-Polymers with Different Oligothiophene Donor Units Adv. Funct. Mater. 2014, 24, 1151-1162
-
(2014)
Adv. Funct. Mater.
, vol.24
, pp. 1151-1162
-
-
Luzio, A.1
Fazzi, D.2
Natali, D.3
Giussani, E.4
Baeg, K.-J.5
Chen, Z.6
Noh, Y.-Y.7
Facchetti, A.8
Caironi, M.9
-
35
-
-
84901982997
-
Effect of Annealing Temperature on Film Morphology of Organic-Inorganic Hybrid Pervoskite Solid-State Solar Cells
-
Dualeh, A.; Tetreault, N.; Moehl, T.; Gao, P.; Nazeeruddin, M. K.; Gratzel, M. Effect of Annealing Temperature on Film Morphology of Organic-Inorganic Hybrid Pervoskite Solid-State Solar Cells Adv. Funct. Mater. 2014, 24, 3250-3258
-
(2014)
Adv. Funct. Mater.
, vol.24
, pp. 3250-3258
-
-
Dualeh, A.1
Tetreault, N.2
Moehl, T.3
Gao, P.4
Nazeeruddin, M.K.5
Gratzel, M.6
-
36
-
-
84892715623
-
An Inorganic Hole Conductor for Organo-Lead Halide Perovskite Solar Cells. Improved Hole Conductivity with Copper Iodide
-
Christians, J. A.; Fung, R. C.; Kamat, P. V. An Inorganic Hole Conductor for Organo-Lead Halide Perovskite Solar Cells. Improved Hole Conductivity with Copper Iodide J. Am. Chem. Soc. 2014, 136, 758-764
-
(2014)
J. Am. Chem. Soc.
, vol.136
, pp. 758-764
-
-
Christians, J.A.1
Fung, R.C.2
Kamat, P.V.3
-
37
-
-
84881366683
-
Mechanism of Carrier Accumulation in Perovskite Thin-Absorber Solar Cells
-
Kim, H. S.; Mora-Sero, I.; Gonzalez-Pedro, V.; Fabregat-Santiago, F.; Juarez-Perez, E. J.; Park, N. G.; Bisquert, J. Mechanism of Carrier Accumulation in Perovskite Thin-Absorber Solar Cells Nat. Commun. 2013, 4, 2242
-
(2013)
Nat. Commun.
, vol.4
, pp. 2242
-
-
Kim, H.S.1
Mora-Sero, I.2
Gonzalez-Pedro, V.3
Fabregat-Santiago, F.4
Juarez-Perez, E.J.5
Park, N.G.6
Bisquert, J.7
-
38
-
-
84900464985
-
3: Structure, Charge-Carrier Dynamics, and Photovoltaic Properties of Perovskite Solar Cells
-
3: Structure, Charge-Carrier Dynamics, and Photovoltaic Properties of Perovskite Solar Cells J. Phys. Chem. C 2014, 118, 9412-9418
-
(2014)
J. Phys. Chem. C
, vol.118
, pp. 9412-9418
-
-
Zhao, Y.1
Zhu, K.2
|