High conductivity PEDOT:PSS thin films affording improved open circuit voltages in PEDOT:PSS-Si heterojunction solar cells

Abstract

Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS)-Si heterojunction solar cells (HSCs) have the characteristics of low cost and simple preparation process, which is expected to realize the manufacture of high-performance solar cells. Among them, The modification of PEDOT:PSS has become the most important and feasible method to improve the photoelectric conversion efficiency (PCE) of PEDOT:PSS-Si HSCs. Here, we design a novel hybrid nanostructure of Co9S8 nanoparticles uniformly loaded onto the surface of multi-walled carbon nanotubes (Co9S8@N,P-MWCNT) as a dopant to improve the performance of PEDOT:PSS. The analysis of experimental data reveals that the dopant could effectively suppress the recombination losses of PEDOT:PSS-Si interface, which is conducive to the improvement of open circuit voltage (Voc). The HSCs reaching a PCE of 13.44%, while achieving a high Voc of 645 mV.