Trapping effects on the frequency response of dithiolene-based planar photodetectors

Synthetic Metals

Volumn 157, Issue 22-23, 2007, Pages 984-987

  Agostinelli, T ^a   Caironi, M ^a   Natali, D ^a   Sampietro, M ^a   Arca, M ^b   Devillanova, F A ^b   Ferrero, V ^c  

^a POLITECNICO DI MILANO   (Italy)

^b UNIVERSITY OF CAGLIARI   (Italy)

^c POLITECNICO DI TORINO   (Italy)

Author keywords

Modulated photocurrent; Organic photodetectors; Trap density distribution

Indexed keywords

CARRIER TRANSPORT; CHARGE TRAPPING; FREQUENCY RESPONSE; GAUSSIAN DISTRIBUTION; LASER PULSES; PHOTOCURRENTS;

ORGANIC PLANAR PHOTODETECTORS; TRAP DENSITY DISTRIBUTION;

PHOTODETECTORS;

EID: 37849005374     PISSN: 03796779     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.synthmet.2007.10.006     Document Type: Article

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18. The origin of the observed traps is hardly attributable to the delayed dissociation (i.e. detrapping) of the coulombically bound photogenerated geminate pairs, because the latters should live at least for 1 μs before dissociation in order to be resolved in our experiment; in fact, we are sensitive to 1 μs long release times at best, being the scanning frequency range 10 Hz to 1 MHz. However, 1 μs is a lifetime too long for both singlet excitons [M. Pope, C.E. Swenberg, Electronic Processes in Organic Crystals and Polymers, 2nd ed., 928 (1999)] and triplet excitons, at least in presence of a heavy metal (Pd in our case) that improves intersystem crossing to the ground singlet exciton. [M.A. Baldo, S. Lamansky, P.E. Burrows, M.E. Thompson, S.R. Forrest, Appl. Phys. Lett. 75 (1999) 4].
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