The effect of carrier mobility in organic solar cells

Ji Ting Shieh, Chiou Hua Liu, Hsin Fei Meng*, Shin Rong Tseng, Yu Chiang Chao, Sheng Fu Horng


研究成果: 雜誌貢獻期刊論文同行評審

96 引文 斯高帕斯(Scopus)


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 cm2 /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 cm2 /V s while the other one varies from 10-1 to 10-3 cm2 /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.

期刊Journal of Applied Physics
出版狀態已發佈 - 2010 4月 15

ASJC Scopus subject areas

  • 一般物理與天文學


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