Photo-physics of PTB7, PCBM and ICBA based ternary solar cells |
| |
| Affiliation: | 1. School of Physics and Astronomy, and Collaborative Innovation Center of IFSA (CICIFSA), Shanghai Jiao Tong University, Shanghai 200240, China;2. School of Chemistry and Chemical Engineering, and Center for Advanced Electronic Materials and Devices, Shanghai Jiao Tong University, Shanghai 200240, China;3. State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, Guangdong, China;4. Department of Chemistry, Zhejiang University, Hangzhou 310027, Zhejiang, China;5. State Key Laboratory of Fluorinated Materials, Zibo 256401, Shandong, China |
| |
| Abstract: | Indene-C60bisadduct (ICBA) is one of the rare acceptors which can supersede commonly used phenyl-C71-butyric acid methyl ester (PCBM70) in enhancing the performance of bulk heterojunction (BHJ) solar cells owing to its shallower lowest unoccupied molecular orbital (LUMO) level. However, ICBA tends to decrease the photocurrent for most of the low band-gap polymers synthesized to date. Here we examine the interaction of ICBA with the one of the popular low band-gap polymers poly[[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl) carbonyl] thieno[3,4-b]thiophenediyl]] (PTB7), at femtosecond level, to explore key dynamics governing the operation of BHJ cells involving ICBA. The photo-physics of binary and ternary systems based on PTB7 coupled with PCBM70 and/or ICBA are studied by means of transient absorption spectroscopy (TAS) and electrochemical impedance spectroscopy (EIS) and supported by morphology analysis. Our study suggests that both inefficient charge-separation and poor charge transport of ICBA is responsible for relatively low photocurrent generation. |
| |
| Keywords: | PTB7 ICBA PCBM Electrochemical impedance spectroscopy Transient absorption spectroscopy PEIE Carrier concentration Trap |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
