Modeling and simulation of bulk heterojunction organic solar cell

Abstract

The non-fullerene acceptor organic solar cells (NFA-OSCs) have attracted lots of interest due to their higher stability and greater efficiency compared with traditional fullerene acceptor solar cells. Throughout this thesis, we improved the performance parameters of a bulk heterojunction (BHJ) structure of NFA-OSC by adjusting the transport layers characteristics which can be achieved experimentally. The validation of the optimization is done using simulation. SCAPS program has been utilized to simulate the structure and the validity of its simulation has been verified by comparing the I-V characteristics with measurements from a reported literature. In addition, we studied the impact of several parameters such as the thickness of the active layer and its trap density on the cell performance using simulation. According to our presented optimization, some encouraging results were obtained: a short circuit current (Jsc) of 16.2 mA/cm2, open circuit voltage (Voc) of 1.06 V, fill factor (FF) of 82.95% and power conversion efficiency (PCE) of 14.25%. The obtained results pave the way for high efficiency NFA solar cells.