Spectroscopic Study of Electric Field Induced Optical Second Harmonic Generation from PCPDTBT and PC71BM Thin Films

Ibrahim M. ALROUGY  Dai TAGUCHI  Takaaki MANAKA  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E102-C   No.2   pp.119-124
Publication Date: 2019/02/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.2018OMP0007
Type of Manuscript: Special Section PAPER (Special Section on Recent Progress in Organic Molecular Electronics and Biotechnology)
Category: 
Keyword: 
OSCs,  EFISHG,  BHJ,  carrier behaviors,  

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Summary: 
Electric field induced optical second harmonic generation (EFISHG) measurement at the laser wavelength of 1000nm and 1080nm is conducted to investigate the carrier behaviors in PCPDTBT and PC71BM bulk heterojunction organic solar cells (OSCs). We find that the response time for electrode charging through the external circuit in +1V and -1V are almost identical but the response time for the Maxwell-Wagner-type interfacial charging is different in +1V or -1V. We find that the accumulated charges of PC71BM is more than the accumulated charges of PCPDTBT and consequently affects the efficiency of the bulk heterojunction OSCs.