College of Material Science and Chemical Engineering Ningbo University of Technology Ningbo 315211 Zhejiang ChinaQingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of Sciences Qingdao 266101 Shandong China;
College of Material Science and Chemical Engineering Ningbo University of Technology Ningbo 315211 Zhejiang China;
Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of Sciences Qingdao 266101 Shandong China;
Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 ChinaQingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of Sciences Qingdao 266101 Shandong China;
Organic solar cells; Hole transport layer; TTA; Energy level; Charge recombination;