Temperature and Light Modulated Open‐Circuit Voltage in Nonfullerene Organic Solar Cells with Different Effective Bandgaps
В. В. Брус, Nora Schopp, Seo‐Jin Ko, Joachim Vollbrecht, Jaewon Lee, Akchheta Karki, Guillermo C. Bazan, Thuc‐Quyen Nguyen
Abstract
Abstract The relationship of the temperature–light intensity dependence of open‐circuit voltage V oc in nonfullerene‐based organic solar cells with their material characteristics and multimechanism recombination parameters is described. The systematic variation of the effective bandgap E g,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 N c , 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 V oc is shown by applying it to four different donor:nonfullerene acceptor blend systems with conventional or inverted device architectures.