报告人：Prof. Feng Gao
题目：Charge generation in organic solar cells: Investigations on temperature, charge-transfer states, and additives
The power conversion efficiency of organic solar (OSCs) has increased from around 1% to over 10% in the past two decades. In spite of the great success in device efficiency, many fundamental issues concerning basic operational mechanisms of these devices remain unknown or controversial, limiting rational design of donor and acceptor materials. Among others, charge generation might the most fundamental yet most debated issue. We employ straightforward temperature-dependent open-circuit voltage measurements to understand the effect of temperature on charge generation.1 We also employ highly sensitive charge-transfer state measurements to understand the effect of additives on energetic disorder (and hence charge generation) of OSCs.2
1, Physical Review Letters, 114 (12), 128701 (2015)
2, Advanced Materials, DIO: 10.1002/adma.201405913
Dr Feng Gao is an assistant professor at the Department of Physics, Chemistry and Biology (IFM) at Link?ping University (Sweden), working on solar energy. In his PhD work at the Cavendish Laboratory of University of Cambridge (UK), he studied device physics of polymer-based solar cells. Before that, he obtained his BSc and MSc degrees in physics from Nanjing University (China).