Reducing Voltage Losses of Organic Solar Cells against Energetics Modifications by Thermal Stress.
- Resource Type
- Academic Journal
- Authors
- Wang LH; School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan250100, P. R. China.; Zhang KN; School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan250100, P. R. China.; Sun M; School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan250100, P. R. China.; Li M; School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan250100, P. R. China.; Cai XF; School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan250100, P. R. China.; Tan Y; School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan250100, P. R. China.; Hao XT; School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan250100, P. R. China.; ARC Centre of Excellence in Exciton Science, School of Chemistry, The University of Melbourne, Parkville, Victoria3010, Australia.; Du XY; School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan250100, P. R. China.; Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou510640, P. R. China.
- Source
- Publisher: American Chemical Society Country of Publication: United States NLM ID: 101526034 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1948-7185 (Electronic) Linking ISSN: 19487185 NLM ISO Abbreviation: J Phys Chem Lett Subsets: PubMed not MEDLINE; MEDLINE
- Subject
- Language
- English
Voltage losses are one of the main obstacles for further improvement in the power conversion efficiency of organic solar cells. In this work, we investigate the effect of thermal stress on voltage losses in various material systems by multiple spectroscopic measurements on both devices and thin films. The energetics of nonfullerene small molecules are more readily altered under thermal stress compared to all-polymer and fullerene-based systems, thereby strongly affecting open-circuit voltage. These energetics variations correlate with the glass transition of respective materials. While nonfullerene small molecular acceptor systems exhibit both dynamic and static disorders which can be restrained in annealed films, all-polymeric systems exhibit dominated static disorders, which are also stable against thermal stress. The much higher voltage losses in fullerene-based systems compared to the other two counterparts are mainly due to the losses from device band gap to charge transfer states and the high nonradiative recombination.