A simple doping strategy to improve PEDOT:PSS charge extraction capability in polymer solar cells. (15th November 2022)

• Record Type: Journal Article
• Authors: Wang, Zhongqiang; Zou, Xuefeng; Zhao, Min; Wang, Jingkun; Wang, Xiaoliang; Hao, Yuying; Wang, Hua
• Is Part Of: Solar energy. Volume 247(2022)
• Page Start: 109
• Page End: 114
• Publication Date: 2022-11-15
• Subjects: Hole transport layers -- Polymer solar cells -- PEDOT:PSS -- Black phosphorus -- High efficiency; Solar energy -- Periodicals; Solar engines -- Periodicals; 621.47
• DOI: 10.1016/j.solener.2022.10.028
• Languages: English
• ISSNs: 0038-092X

Abstract

Highlights: An efficient HTL is formed by liquid-exfoliated BP nanosheets and PEDOT:PSS, which is demonstrated a simple and effective strategy to form efficient HTL in high-efficiency PSCs. The introduction of BP nanosheets significantly affect the conductivity and aggregation morphology of PEDOT:PSS. The introduction of BP nanosheets dramatically changes the nanostructure of PEDOT:PSS and light absorbers. A champion PCE of 16.41% was obtained in PM6:Y6 light absorber based cell using PEDOT:PSS:BP as the HTL, which is ∼18% efficiency improvement compare to the PSCs that with pure PEDOT:PSS as the HTL. Abstract: Black Phosphorus (BP) has shown great potential in optoelectronic devices due to its remarkable semiconductor properties. Herein, liquid-exfoliated BP nanosheets is doped into poly(3, 4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) to form a hybrid hole transport layers (HTLs). The incorporation of BP nanosheets in PEDOT:PSS dramatically changes the nanostructure and electrical conductivity of film. The BP doped PEDOT:PSS HTLs possess excellent charge selectivity and transport capability, which are proved in non-fullerene and fullerene blend system based polymer solar cells (PSCs). Furthermore, the nanostructure of PM6:Y6 light absorber changes a lot after introduction of BP nanosheets. Thus, weak charge recombination loss, high exciton generation rate and dissociation probability, and low transport resistance are observed in BP nanosheets doped PEDOT:PSS HTLs based cells, which result in improved power conversion efficiency (PCE). As a result, significant improvement of PCE (>18%) is observed in both non-fullerene and fullerene blend systems based cells. This result demonstrates a simple and effective strategy to form efficient HTLs in high-efficiency PSCs.