P3HT:PCBM bulk-heterojunctions: Observing interfacial and charge transfer states with surface photovoltage spectroscopy

Journal of Physical Chemistry C

Volumn 118, Issue 27, 2014, Pages 14723-14731

  Osterloh, Frank E ^a   Holmes, Michael A ^a   Zhao, Jing ^a   Chang, Lilian ^b   Kawula, Steven ^b   Roehling, John D ^b   Moulé, Adam J ^b  

^a UNIVERSITY OF CALIFORNIA   (United States)

^b University of California   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

CHARGE TRANSFER; ELECTRIC CHARGE; HETEROJUNCTIONS; INTERFACE STATES; MOLECULAR ORBITALS; SEMICONDUCTOR DEVICE MODELS; SUBSTRATES; SURFACE PROPERTIES;

BUILT-IN ELECTRIC FIELDS; CHARGE TRANSFER STATE; MOLECULAR ORBITAL ENERGY; ORGANIC PHOTOVOLTAIC FILMS; POLY-3-HEXYLTHIOPHENE; SUBSTRATE DEPENDENCES; SURFACE PHOTOVOLTAGE SPECTROSCOPY; SURFACE PHOTOVOLTAGES;

INTERFACES (MATERIALS);

EID: 84904279207     PISSN: 19327447     EISSN: 19327455     Source Type: Journal    
DOI: 10.1021/jp500226u     Document Type: Article

References (79)

1. Hiramoto, M.; Fujiwara, H.; Yokoyama, M. P-I-N Like Behavior in 3-Layered Organic Solar-Cells Having a Co-Deposited Interlayer of Pigments J. Appl. Phys. 1992, 72, 3781-3787
2. Y You, J.; Dou, L.; Yoshimura, K.; Kato, T.; Ohya, K.; Moriarty, T.; Emery, K.; Chen, C. C.; Gao, J.; Li, G. A Polymer Tandem Solar Cell with 10.6% Power Conversion Efficiency Nat. Commun. 2013, 4, 1446
3. Hadipour, A.; de Boer, B.; Blom, P. W. M. Organic Tandem and Multi-Junction Solar Cells Adv. Funct. Mater. 2008, 18, 169-181
4. Deibel, C.; Dyakonov, V. Polymer-Fullerene BHJ Solar Cells (Review) Rep. Prog. Phys. 2010, 73, 096401
5. Clarke, T. M.; Durrant, J. R. Charge Photogeneration in Organic Solar Cells Chem. Rev. 2010, 110, 6736-6767
6. Schlenker, C. W.; Thompson, M. E. The Molecular Nature of Photovoltage Losses in Organic Solar Cells Chem. Commun. 2011, 47, 3702-3716
7. Mayer, A. C.; Scully, S. R.; Hardin, B. E.; Rowell, M. W.; McGehee, M. D. Polymer-Based Solar Cells Mater. Today 2007, 10, 28-33
8. Street, R. A.; Davies, D.; Khlyabich, P. P.; Burkhart, B.; Thompson, B. C. Origin of the Tunable Open-Circuit Voltage in Ternary Blend Bulk Heterojunction Organic Solar Cells J. Am. Chem. Soc. 2013, 135, 986-989
9. Vandewal, K.; Gadisa, A.; Oosterbaan, W. D.; Bertho, S.; Banishoeib, F.; Van Severen, I.; Lutsen, L.; Cleij, T. J.; Van der Zande, D.; Manca, J. V. The Relation between Open-Circuit Voltage and the Onset of Photocurrent Generation by Charge-Transfer Absorption in Polymer: Fullerene Bulk Heterojunction Solar Cells Adv. Funct. Mater. 2008, 18, 2064-2070
10. Vandewal, K.; Gadisa, A.; Tvingstedt, K.; Inganas, O.; Manca, J. V. On the Origin of the Open-Circuit Voltage of Polymer-Fullerene Solar Cells Nat. Mater. 2009, 8, 904-909
11. Cowan, S. R.; Roy, A.; Heeger, A. J. Recombination in Polymer-Fullerene Bulk Heterojunction Solar Cells Phys. Rev. B 2010, 82, 245207
12. Janssen, R. A. J.; Veldman, D. The Energy of Charge-Transfer States in Electron Donor-Acceptor Blends: Insight into the Energy Losses in Organic Solar Cells Adv. Funct. Mater. 2009, 19, 1939-1948
13. Nelson, J.; Durrant, J. R.; Poplavskyy, D. CT in PCBM MDMO-PPV Adv. Funct. Mater. 2005, 15, 1171-1182
14. Tvingstedt, K.; Inganas, O.; Manca, J. V. Electroluminescence from Charge Transfer States in Polymer Solar Cells J. Am. Chem. Soc. 2009, 131, 11819-11824
15. Dimitrov, S. D.; Bakulin, A. A.; Nielsen, C. B.; Schroeder, B. C.; Du, J. P.; Bronstein, H.; McCulloch, I.; Friend, R. H.; Durrant, J. R. On the Energetic Dependence of Charge Separation in Low-Band-Gap Polymer/Fullerene Blends J. Am. Chem. Soc. 2012, 134, 18189-18192
16. Behrends, J. Direct Detection of Photoinduced Charge Transfer Complexes in Polymer Fullerene Blends Phys. Rev. B 2012, 85, 125206
17. Benson-Smith, J. J.; Goris, L.; Vandewal, K.; Haenen, K.; Manca, J. V.; Vanderzande, D.; Bradley, D. D. C.; Nelson, J. Formation of a Ground-State Charge-Transfer Complex in Polyfluorene/ 6,6-Phenyl-C-61 Butyric Acid Methyl Ester (PCBM) Blend Films and Its Role in the Function of Polymer/PCBM Solar Cells Adv. Funct. Mater. 2007, 17, 451-457
18. Liang, Z. Q.; Gregg, B. A. Compensating Poly(3-hexylthiophene) Reveals Its Doping Density and Its Strong Exciton Quenching by Free Carriers Adv. Mater. 2012, 24, 3258-3262
19. Cook, S.; Furube, A.; Katoh, R. Matter of Minutes Degradation of Poly(3-hexylthiophene) under Illumination in Air J. Mater. Chem. 2012, 22, 4282-4289
20. Manceau, M.; Rivaton, A.; Gardette, J. L.; Guillerez, S.; Lemaitre, N. The Mechanism of Photo- and Thermooxidation of Poly(3-hexylthiophene) (P3HT) Reconsidered Polym. Degrad. Stab. 2009, 94, 898-907
21. Gregg, B. A. Charged Defects in Soft Semiconductors and Their Influence on Organic Photovoltaics Soft Matter 2009, 5, 2985-2989
22. Kahn, A.; Koch, N.; Gao, W. Electronic Structure and Electrical Properties of Interfaces between Metals and π-Conjugated Molecular Films J. Polym. Sci., Polym. Phys. Ed. 2003, 41, 2529-2548
23. Meyer, J.; Hamwi, S.; Riedl, T.; Kahn, A. Transition Metal Oxides for Organic Electronics: Energetics, Device Physics and Applications Adv. Mater. 2012, 24, 5408-5427
24. Olthof, S.; Mehraeen, S.; Mohapatra, S. G.; Barlow, S.; Coropceanu, V.; Bredas, J. L.; Marder, S. R.; Kahn, A. Ultralow Doping in Organic Semiconductors: Evidence of Trap Filling Phys. Rev. Lett. 2012, 109, 176601
25. Frisch, J.; Koch, N.; Neher, D. Full Electronic Structure across a Polymer Heterojunction Solar Cell J. Mater. Chem. 2012, 22, 4418-1124
26. Hwang, J.; Wan, A.; Kahn, A. Energetics of Metal-Organic Interfaces: New Experiments and Assessment of the Field Mater. Sci. Eng. 2009, 64, 1-31
27. Greiner, M. T. Universal Energy-Level Alignment of Molecules on Metal Oxides Nat. Mater. 2012, 11, 76-81
28. Bisquert, J.; Garcia-Belmonte, G.; Munar, A.; Sessolo, M.; Soriano, A.; Bolink, H. J. Band Unpinning and Photovoltaic Model for P3HT:PCBM Organic Bulk Heterojunctions under Illumination Chem. Phys. Lett. 2008, 465, 57-62
29. Yang, B.; Guo, F.; Yuan, Y.; Xiao, Z.; Lu, Y.; Dong, Q.; Huang, J. Solution-Processed Fullerene-Based Organic Schottky Junction Devices for Large-Open-Circuit-Voltage Organic Solar Cells Adv. Mater. 2013, 25, 572-577
30. Seki, K. Energy Level Alignment and Interfacial Electronic Structures at Organic/Metal and Organic/Organic Interfaces Adv. Mater. 1999, 11, 605-625
31. Osterloh, F. E.; Holmes, M. A.; Chang, L.; Moule, A. J.; Zhao, J. Photochemical Charge Separation in Poly(3-hexylthiophene) (P3HT) Films Observed With Surface Photovoltage Spectroscopy J.Phys.Chem. C 2013, 117, 26905-26913
32. Kronik, L.; Shapira, Y. Surface Photovoltage Phenomena: Theory, Experiment, and Applications Surf. Sci. Rep 1999, 37, 1-206
33. Kronik, L.; Shapira, Y. Surface Photovoltage Spectroscopy of Semiconductor Structures: At the Crossroads of Physics, Chemistry and Electrical Engineering Surf. Interface Anal. 2001, 31, 954-965
34. Zhao, J.; Osterloh, F. E. Photochemical Charge Separation in Nanocrystal Photocatalyst Films-Insights from Surface Photovoltage Spectroscopy J. Phys. Chem. Lett. 2014, 5, 782-786
35. Luria, J. L.; Hoepker, N.; Bruce, R.; Jacobs, A. R.; Groves, C.; Marohn, J. A. Spectroscopic Imaging of Photopotentials and Photoinduced Potential Fluctuations in a Bulk Heterojunction Solar Cell Film ACS Nano 2012, 6, 9392-9401
36. Burstein, L.; Bregman, J.; Shapira, Y. Characterization of Interface States at III-V Compound Semiconductor-Metal Interfaces J. Appl. Phys. 1991, 69, 2312-2316
37. Lagowski, J.; Jastrzebski, L.; Cullen, G. W. Electronic Characterization of Hetero-Epitaxial Silicon-on-Sapphire by Surface Photo-Voltage Spectroscopy J. Electrochem. Soc. 1981, 128, 2665-2670
38. Musser, M. E.; Dahlberg, S. C. The Surface Photo-Voltage of Polymethine Semiconducting-Films J. Chem. Phys. 1980, 72, 4084-4088
39. 2:F Heterojunction by Surface Photovoltage Spectroscopy Appl. Phys. Lett. 1997, 71, 3305-3307
40. Li, Y.; He, Y. Fullerene Derivative Acceptors for High Performance OPV Phys. Chem. Chem. Phys. 2011, 13, 1970-1983
41. Kang, H.; Yoon, S. C. Controlling Number of Indene Solubilizing Groups in Multiadduct Fullerenes for Tuning Optoelectronic Properties and Open-Circuit Voltage in Organic Solar Cells ACS Appl. Mater. Interfaces 2012, 4, 110-116
42. Halls, J. J. M.; Walsh, C. A.; Greenham, N. C.; Marseglia, E. A.; Friend, R. H.; Moratti, S. C.; Holmes, A. B. Efficient Photodiodes from Interpenetrating Polymer Networks Nature 1995, 376, 498-500
43. Heeger, A. J.; Yu, G. Polymer PV Cells: Enhanced Efficiencies via a Network of Internal Donor-Acceptor Heterojunctions Science 1995, 270, 1789-1791
44. Chang, L.; Holmes, M. A.; Waller, M.; Osterloh, F. E.; Moule, A. J. Calcium Niobate Nanosheets as Novel Electron Transport Material for Solution-Processed Multijunction Polymer Solar Cell J. Mater. Chem. 2012, 22, 20443-20450
45. Schaak, R. E.; Mallouk, T. E. Self-Assembly of Tiled Perovskite Monolayer and Multilayer Thin Films Chem. Mater. 2000, 12, 2513-2516
46. x Interlayer J. Phys. Chem. C 2009, 113, 17268-17273
47. Roehling, J. D.; Arslan, I.; Moule, A. J. Controlling Microstructure in Poly(3-hexylthiophene) Nanofibers J. Mater. Chem. 2012, 22, 2498-2506
48. Cook, S.; Ohkita, H.; Kim, Y.; Benson-Smith, J. J.; Bradley, D. D. C.; Durrant, J. R. A Photophysical Study of PCBM Thin Films Chem. Phys. Lett. 2007, 445, 276-280
49. Kratschmer, W.; Lamb, L. D.; Fostiropoulos, K.; Huffman, D. R. Solid C-60-A New Form Of Carbon Nature 1990, 347, 354-358
50. Kazaoui, S.; Ross, R.; Minami, N. Intermolecular Charge-Transfer Excitation in C60 Films: Evidence from Luminescence and Photoconductivity Phys. Rev. B 1995, 52, 11665-11668
51. Eilmes, A.; Munn, R. W.; Pac, B.; Petelenz, P. Charge-Transfer States and the Band Gap in Crystalline Fullerene Chem. Phys. 1997, 214, 341-349
52. Munn, R. W.; Pac, B.; Petelenz, P. Charge-Transfer-Induced Frenkel Exciton Splitting in Crystalline Fullerene Phys. Rev. B 1998, 57, 1328-1331
53. Tamura, H.; Tsukada, M. Role of Intermolecular Charge Delocalization on Electron Transport in Fullerene Aggregates Phys. Rev. B 2012, 85, 054301
54. Haddon, R. C.; Brus, L. E. Electronic Structure and Bonding in C60 Chem. Phys. Lett. 1986, 125, 459-464
55. Leach, S.; Vervloet, M.; Despres, A.; Breheret, E.; Hare, J. P.; Dennis, T. J.; Kroto, H. W.; Taylor, R.; Walton, D. R. M. Electronic Spectra and Transitions of the Fullerene C60 Chem. Phys. 1992, 160, 451-466
56. Mishori, B.; Shapira, Y.; BeluMarian, A.; Manciu, M.; Devenyi, A. Studies of C-60 Thin Films Using Surface Photovoltage Spectroscopy Chem. Phys. Lett. 1997, 264, 163-167
57. Bisquert, J.; Garcia-Belmonte, G.; Munar, A.; Sessolo, M.; Soriano, A.; Bolink, H. J. Band Unpinning and Photovoltaic Model for P3HT:PCBM Organic Bulk Heterojunctions Under Illumination Chem. Phys. Lett. 2008, 465, 57-62
58. Sirringhaus, H.; Brown, P. J.; Friend, R. H.; Nielsen, M. M.; Bechgaard, K.; Langeveld-Voss, B. M. W.; Spiering, A. J. H.; Janssen, R. A. J.; Meijer, E. W.; Herwig, P. Two-Dimensional Charge Transport in Self-Organized, High-Mobility Conjugated Polymers Nature 1999, 401, 685-688
59. Xu, Z.; Chen, L. M.; Chen, M. H.; Li, G.; Yang, Y. Energy Level Alignment of Poly(3-hexylthiophene): 6,6-Phenyl C-61 Butyric Acid Methyl Ester Bulk Heterojunction Appl. Phys. Lett. 2009, 95, 013301
60. Davis, R. J.; Lloyd, M. T.; Ferreira, S. R.; Bruzek, M. J.; Watkins, S. E.; Lindell, L.; Sehati, P.; Fahlman, M.; Anthony, J. E.; Hsu, J. W. P. Determination of Energy Level Alignment at Interfaces of Hybrid and Organic Solar Cells Under Ambient Environment J. Mater. Chem. 2011, 21, 1721-1729
61. Roehling, J. D.; Batenburg, K. J.; Swain, F. B.; Moulé, A. J.; Arslan, I. Three-Dimensional Concentration Mapping of Organic Blends Adv. Funct. Mater. 2013, 23, 2115-2122
62. Wodo, O.; Roehling, J. D.; Moule, A. J.; Ganapathysubramanian, B. Quantifying Organic Solar Cell Morphology: A Computational Study of Three-Dimensional Maps Energy Environ. Sci. 2013, 6, 3060-3070
63. Mauger, S. A.; Chang, L.; Friedrich, S.; Rochester, C. W.; Huang, D. M.; Wang, P.; Moulé, A. J. Self-Assembly of Selective Interfaces in Organic Photovoltaics Adv. Funct. Mater. 2013, 23, 1935-1946
64. Fefer, E.; Kronik, L.; Leibovitch, M.; Shapira, Y.; Riedl, W. In-Situ Monitoring of Surface Chemistry and Charge Transfer at Semiconductor Surfaces Appl. Surf. Sci. 1996, 104, 61-67
65. Ishii, H.; Sugiyama, K.; Ito, E.; Seki, K. Energy Level Alignment and Interfacial Electronic Structures at Organic Metal and Organic Organic Interfaces Adv. Mater. 1999, 11, 605-625
66. Würfel, P. Physics of Solar Cells From Principles to New Concepts; Wiley-VCH: Weinheim, 2005; p 244.
67. Nelson, J. The Physics of Solar Cells; Imperial College Press: London, 2004; p 363.
68. Glatthar, M.; Mingirulli, N.; Zimmermann, B.; Ziegler, T.; Kern, R.; Niggemann, M.; Hinsch, A.; Gombert, A. Impedance Spectroscopy on Organic Bulk-Heterojunction Solar Cells Phys. Status Solidi A 2005, 202, R125-R127
69. Garcia-Belmonte, G.; Munar, A.; Barea, E. M.; Bisquert, J.; Ugarte, I.; Pacios, R. Charge Carrier Mobility and Lifetime of Organic Bulk Heterojunctions Analyzed by Impedance Spectroscopy Org. Electron. 2008, 9, 847-851
70. Di Nuzzo, D.; van Reenen, S.; Janssen, R. A. J.; Kemerink, M.; Meskers, S. C. J. Evidence for Space-Charge-Limited Conduction in Organic Photovoltaic Cells at Open-Circuit Conditions Phys. Rev. B 2013, 87, 085207
71. Morfa, A. J.; Nardes, A. M.; Shaheen, S. E.; Kopidakis, N.; van de Lagemaat, J. Time-of-Flight Studies of Electron-Collection Kinetics in Polymer:Fullerene Bulk-Heterojunction Solar Cells Adv. Funct. Mater. 2011, 21, 2580-2586
72. Tengstedt, C.; Osikowicz, W.; Parker, I. D.; Hsu, C. H.; Fahlman, M. Fermi-Level Pinning at Conjugated Polymer Interfaces Appl. Phys. Lett. 2006, 88, 053502
73. Xu, Z.; Chen, L. M.; Chen, M. H.; Li, G.; Yang, Y. Energy Level Alignment of Poly-3-hexylthiophene: 6,6-Phenyl C61 Butyric Acid Methyl Ester Bulk Heterojunction Appl. Phys. Lett. 2009, 95, 013301
74. Lide, D. R., Electron Work Function of the Elements. CRC Handbook of Chemistry and Physics; CRC Press: Boca Raton, FL, 2008.
75. Xu, Y.; Schoonen, M. A. A. The Absolute Energy Positions of Conduction and Valence Bands of Selected Semiconducting Minerals Am. Mineral. 2000, 85, 543-556
76. Tvrdy, K.; Frantsuzov, P. A.; Kamat, P. V. Photoinduced Electron Transfer From Semiconductor Quantum Dots to Metal Oxide Nanoparticles Proc. Natl. Acad. Sci. U.S.A. 2011, 108, 29-34
77. Hamilton, R.; Shuttle, C. G.; O'Regan, B.; Hammant, T. C.; Nelson, J.; Durrant, J. R. Recombination in Annealed and Nonannealed Polythiophene/Fullerene Solar Cells: Transient Photovoltage Studies versus Numerical Modeling J. Phys. Chem. Lett. 2010, 1, 1432-1436
78. Padinger, F.; Rittgerber, R. S.; Sariciftci, S. Effects of Postproduction Treatment on Plastic Solar Cells. Advanced Functional Materials Adv. Funct. Mater. 2003, 13, 85
79. Moule, A. J.; Meerholz, K. Morphology Control in Solution-Processed Bulk-Heterojunction Solar Cell Mixtures Adv. Funct. Mater. 2009, 19, 3028-3036