Phase Separation to Improve the Conductivity and Work Function of the PEDOT:PSS Solution for Silicon Hybrid Solar Cells

• DOI: 10.1021/acs.jpcc.1c08816
• Publication Date: 2021-11-30T22:59:32Z
• Authors: Qi Geng; Zhe Wang; Zhongliang Gao; Ting Gao; Yingfeng Li; Lei Chen; Meicheng Li
• Keywords: Polystyrene sulfonate

Poly(3,4-ethylenedioxythiophene): polystyrene sulfonate (PEDOT:PSS) is usually used as a hole-selective contact layer in photovoltaic and optoelectronic fields due to its good film-forming property low cost. However, PSS dispersant an insulating material that restricts the conductivity of PEDOT:PSS films. In this work, we modified solution by heat treatment realize double improvement work function film for PEDOT:PSS/Si hybrid solar cells (HSCs). It was found phase separation occurs process solution, which causes dispersed PEDOT agglomerate into strips form conductive grid. By optimizing temperatures, electrical increased from 1090 1305 S/cm at 90 °C. addition, composition changed increase value PEDOT/PSS 55.12%, 4.5 4.8 eV. After calculation with finite volume method, band bending Si surface heterogeneous 0.216 eV, more conducive carrier separation. Finally, power conversion efficiency heat-treated applied HSCs 11.03 12.38% compared nonheat-treated HSCs.