標題: Use of Ultrafast Time-Resolved Spectroscopy to Demonstrate the Effect of Annealing on the Performance of P3HT:PCBM Solar Cells
作者: Wang, Yu-Ting
Chen, Mei-Hsin
Lin, Chao-Ting
Fang, Jian-Jhih
Chang, Che-Jui
Luo, Chih-Wei
Yabushita, Atsushi
Wu, Kaung-Hsiung
Kobayashi, Takayoshi
電子物理學系
Department of Electrophysics
關鍵字: organic solar cells;ultrafast dynamics;annealing effect
公開日期: 4-Mar-2015
摘要: The organic solar cells of heterojunction system, ITO/PEDOT:PSS/P3HT:PCBM/Al, with a thermal annealing after deposition of Al exhibit better performance than those with an annealing process before deposition of Al. In this study, ultrafast time-resolved spectroscopy is employed to reveal the underlying mechanism of annealing effects on the performance of P3HT:PCBM solar cell devices. The analyses of all decomposed relaxation processes show that the postannealed devices exhibit an increase in charge transfer, in the number of separated polarons and a reduction in the amount of recombination between excited carriers. Moreover, the longer lifetime for the excited carriers in postannealed devices indicates it is more likely to be dissociated into photocarriers and result in a larger value for photocurrent, which demonstrates the physical mechanism for increased device performance.
URI: http://dx.doi.org/10.1021/am508091u
http://hdl.handle.net/11536/124712
ISSN: 1944-8244
DOI: 10.1021/am508091u
期刊: ACS APPLIED MATERIALS & INTERFACES
起始頁: 4457
結束頁: 4462
Appears in Collections:Articles