Temperature and Light Modulated Open‐Circuit Voltage in Nonfullerene Organic Solar Cells with Different Effective Bandgaps
Abstract
The relationship of the temperature–light intensity dependence of open‐circuit voltage Voc in nonfullerene‐based organic solar cells with their material characteristics and multimechanism recombination parameters is described. The systematic variation of the effective bandgap Eg,eff and the electrode layers allows the observation of different relative contributions of bimolecular, bulk, and surface trap‐assisted recombination mechanisms. The complementary advantages of the analytical model and the established voltage‐impedance spectroscopy technique provide a useful tool to quantify multimechanism recombination parameters, effective density of states Nc, and energetic disorder σ in organic solar cells under operating conditions. The validity of the proposed model to understand the temperature and light intensity dependent of Voc is shown by applying it to four different donor:nonfullerene acceptor blend systems with conventional or inverted device architectures.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Dec 13, 2020
- Source ID
- 10.1002/aenm.202003091
Entities
People
- Akchheta Karki
- Guillermo C. Bazan
- Jaewon Lee
- Joachim Vollbrecht
- Nora Schopp
- Seo‐Jin Ko
- Thuc‐quyen Nguyen
- Viktor Brus
Organizations
- Chungnam National University
- Korea Research Institute of Chemical Technology
- Nazarbayev University
- Office of Naval Research
- University of California, Santa Barbara