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Competition between Exciplex Formation and Photocarrier Generation in Molecular-Scale Donor-Acceptor Heterojunctions

Published online by Cambridge University Press:  30 July 2013

Jun’ya Tsutsumi ,
Toshikazu Yamada ,
Hiroyuki Matsui  and
Tatsuo Hasegawa
Jun’ya Tsutsumi
Affiliation:
Flexible Electronics Research Center (FLEC), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8562, Japan.
Toshikazu Yamada
Affiliation:
Flexible Electronics Research Center (FLEC), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8562, Japan.
Hiroyuki Matsui
Affiliation:
Flexible Electronics Research Center (FLEC), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8562, Japan.
Tatsuo Hasegawa
Affiliation:
Flexible Electronics Research Center (FLEC), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8562, Japan.
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Abstract

Donor-acceptor mixed-stack charge-transfer (CT) compounds can be regarded as a model system for charge carrier separation in molecular-scale donor-acceptor heterojunctions. Here we investigated fundamental photocarrier generation characteristics in single crystals of a donoracceptor mixed-stack system, phenothiazine-tetracyanoquinodimethane (PTZ-TCNQ). The laser beam-induced current (LBIC) measurement on the crystals allowed the discrimination between the exciton and the photocarrier diffusion on the basis of the observed spatial decay profiles. We found that the photocarriers are directly generated by higher-lying CT band excitation and exhibit extremely long diffusion length reaching more than 10 μm. We discuss the origin of the efficient photocarrier generation in terms of the geminate electron-hole pair formation.

Keywords

organicphotovoltaicdiffusion
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1435: Symposium J – Organic and Hybrid-Organic Electronics , 2012 , mrss12-1435-j10-13
Copyright
Copyright © Materials Research Society 2013 

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