期刊
JOURNAL OF PHYSICS D-APPLIED PHYSICS
卷 48, 期 44, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/0022-3727/48/44/445106
关键词
organic solar cells; drift-diffusion model; energetic disorder; space-charge effects; device physics
资金
- Research Grant of Kwangwoon University
- Basic Science Research Program through the National Foundation of Korea (NRF) - Ministry of Science, ICT AMP
- Future planning [2014R1A1A1002217]
- National Research Foundation of Korea [2014R1A1A1002217] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The loss of photocurrent efficiency by space-charge effects in organic solar cells with energetic disorder was investigated to account for how energetic disorder incorporates spacecharge effects, utilizing a drift-diffusion model with field-dependent charge-pair dissociation and suppressed bimolecular recombination. Energetic disorder, which induces the Poole-Frenkel behavior of charge carrier mobility, is known to decrease the mobility of charge carriers and thus reduces photovoltaic performance. We found that even if the mobilities are the same in the absence of space-charge effects, the degree of energetic disorder can be an additional parameter affecting photocurrent efficiency when space-charge effects occur. Introducing the field-dependence parameter that reflects the energetic disorder, the behavior of efficiency loss with energetic disorder can differ depending on which charge carrier is subject to energetic disorder. While the energetic disorder that is applied to higher-mobility charge carriers decreases photocurrent efficiency further, the efficiency loss can be suppressed when energetic disorder is applied to lower-mobility charge carriers.
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