Origin of high open-circuit voltage in a planar heterojunction solar cell containing a non-fullerene acceptor
Abstract
Vapor-deposited, planar heterojunction organic solar cells containing a periflanthene donor and either a fullerene or non-fullerene acceptor are investigated. A high VOC of 1.16 V is observed in devices containing the non-fullerene, pyrrolo[3,4-c]pyrrole-1,4-dione, 3,6-bis(4-chlorophenyl)-2,5-dihydro acceptor, whereas analogous devices containing C60 only result in a VOC of 0.8 V. The measured band energy levels of the two different acceptors do not readily explain the observed difference. Small-perturbation transient photovoltage and transient photocurrent measurements reveal that interfacial charge recombination is comparatively slower for the non-fullerene acceptor, resulting in relatively higher Voc values.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Sep 25, 2017
- Source ID
- 10.1063/1.4997502
Entities
People
- Nongyi Cheng
- Trisha L Andrew
- Yuelin Peng
Organizations
- Air Force Office of Scientific Research
- University of Wisconsin–Madison
- Yusuf Hamied Department of Chemistry