標題: The effect of carrier mobility in organic solar cells
作者: Shieh, Ji-Ting
Liu, Chiou-Hua
Meng, Hsin-Fei
Tseng, Shin-Rong
Chao, Yu-Chiang
Horng, Sheng-Fu
物理研究所
Institute of Physics
公開日期: 15-Apr-2010
摘要: The microscopic states and performance of organic solar cell are investigated theoretically to explore the effect of the carrier mobility. With Ohmic contacts between the semiconductor and the metal electrodes there are two origins of carriers in the semiconductor: the photocarriers generated by photon absorption and the dark carriers diffused from the electrodes. The power efficiency of the solar cell is limited by the recombination of a carrier with either the photocarrier or a dark carrier. Near the short-circuit condition the photocarrier recombination in the semiconductor bulk decreases as the mobility increases. Near the open-circuit condition the dark carrier recombination increases with the mobility. These two opposite effects balance with one another, resulting in an optimal mobility about 10(-2) cm(2)/V s which gives the highest power conversion efficiency. The balance of the electron and hole mobilities are not necessary to maintain the optimal efficiency also because of the balance of the photocarrier and dark carrier recombination. The efficiency remains about the same as one carrier mobility is fixed at 10(-2) cm(2)/V s while the other one varies from 10(-1) to 10(-3) cm(2)/V s. For solar cell with a Schottky barrier between the semiconductor and the metal electrode there is no dark carrier recombination. The efficiency therefore always increases with the mobility. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3327210]
URI: http://dx.doi.org/10.1063/1.3327210
http://hdl.handle.net/11536/5514
ISSN: 0021-8979
DOI: 10.1063/1.3327210
期刊: JOURNAL OF APPLIED PHYSICS
Volume: 107
Issue: 8
結束頁: 
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