Fabrication of CNT-PEDOT:PSS/Si heterojunction carrier selective solar cell

Abstract

In the present paper, we report the development of solution processed Carbon Nano-Tube (CNT) and PEDOT:PSS composite for application in c-Si – organic heterojunction solar cell as hole selective layers. The PEDOT:PSS CNT composite film shows high conductivity and has high optical transparency. The CNT network in the composite film will act as a carrier transport bridge between the PEDOT:PSS domains. Also, the CNT will act like stress centers preventing the breakage of transport path of carriers in composite film, making the CNT-PEDOT:PSS composite an excellent candidate as hole selective layer in flexible solar cells. Thus, the CNT-PEDOT: PSS composite can considerably enhance the performance of CNT-PEDOT: PSS /n-Si solar cells through the synergistic properties of CNT and PEDOT:PSS. The power conversion efficiency of the as-designed solar cell was 9.24% with an open circuit voltage of 576 mV. Dopant-free double heterojunction solar cell making use of MgF2 electron transport layer was also fabricated.