Charge Carrier Dynamics in P3HT:PCBM Polymer Solar Cells Characterized by Impedance Spectroscopy
Forest Shih-Sen Chien1*, Cheng-En Cheng1,2, Cheng-Wei Tsai1, Chen-Te Yu1, Hwa-Wei Shih1, Zingway Pei3, Tsung-Wu Lin4, Chia-Chen Hsu5, Chen-Shiung Chang2
1Department of Applied Physics, Tunghai University, Taichung, Taiwan
2Department of Photonics, National Chiao Tung University, Taichung, Taiwan
3Graduate Institute of Optoelectronic Engineering, Department of Electrical Engineering, National Chung Hsing University, Taichung, Taiwan
4Department of Chemistry, Tunghai University, Taichung, Taiwan
5Department of Physics, National Chung Cheng University, Chiayi, Taiwan
* presenting author:簡世森,
Charge carrier dynamics in P3HT:PCBM polymer solar cells (PSCs) with gold nanoparticles (AuNPs)-embedded and graphene oxide (GO) anode interfacial layers (AILs), and PSCs with thermal treatment are studied by impedance spectroscopy. The hole transit in PSCs with AuNPs- embedded and GO AILs are improved due to lower contact resistance at the AILs/P3HT interface, accounts for the improvement in photovoltaic performance of PSCs. Efficient photo-carrier transit and suppressed exciton recombination are observed in polymer active layer because of thermal-induced phase separation of P3HT and PCBM, explaining the improvement in photovoltaic performance of PSCs after thermal treatment.

Keywords: Bulk-Heterojunction Solar Cells, Impedance Spectroscopy, Hole collection, carrier dynamics