Dual-interface modification effect of Carbon Quantum Dots on the performance of Polymer Solar Cells

Abstract

In this work, carbon quantum dots (CQDs) embedded between buffer layer and active layer and between active layer and cathode could significantly improve the performance of polymer solar cells (PSCs). The device was based on the ITO/PEDOT:PSS/CQDs/P3HT:PC61BM/CQDs/Al architecture. The power conversion efficiency of polymer solar cells with P3HT:PC61BM as active layer increased from 3.18 to 4.31%. And the results show that dual-interface modification of CQDs enables to enhance the electron mobility and hole mobility simultaneously which may be caused by improvement of contact property. In addition, CQDs shown the luminescent down-shifting effect, which was conducive to increase the light conversion of near-ultraviolet and blue-violet portions of sunlight, resulting in enhanced light capture capability of devices. This study provides a simple way to improve PSCs performance.