Berlin 2015 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 19: Organic photovoltaics and electronics - mostly properties of the absorber (with DS)

HL 19.4: Talk

Monday, March 16, 2015, 17:45–18:00, EW 202

Influence of trap distribution on the electrical characteristics of organic solar cells — •Alexander Wagenpfahl, Robert Hanfland, and Carsten Deibel — Chemnitz University of Technology, Institute of Physics, 09126 Chemnitz, Germany

Charge carrier traps have a strong impact on the performance of organic solar cell devices. It remains unclear, however, if either a Gaussion or an exponential distribution of the density of states (DOS) describes most organic photovoltaic devices better. In our work, we apply a macroscopic drift–diffusion simulation in combination with the multiple-trapping and release model to examine how the DOS distribution influences the current-voltage characteristics, diode ideality factor and effective charge carrier mobility of organic solar cells. We compare our findings to corresponding experimental data from different types of organic solar cells to determine the likely DOS shape. Its impact on the experimental device characteristics will be discussed.