Enhancing the Performance of Sn-Pb Perovskite Solar Cells using DBU-Dedoped PEDOT:PSS
Hsing-Jung Hsieh a, Huan-Wei Lin a, Tian-Ya Zeng a, Chieh-Ting Lin a
a National Chung Hsing University, Department of Chemical Engineering, Taiwan
Poster, Hsing-Jung Hsieh, 077
Publication date: 24th October 2023

In our study, we explore the use of 1,8-Diazabicyclo(5.4.0)undec-7-ene (DBU) as a dedoping agent for the modification of PEDOT:PSS, with the objective of reducing its hole population. By decreasing the hole concentration in PEDOT:PSS, we aimed to reduce its conductivity, and minimize the surface recombination occurring at the interface of PEDOT:PSS and SnPb perovskite. Through photoluminescence (PL) analysis, we observed an increase in the PL of perovskite on PEDOT:PSS as the concentration of DBU in PEDOT:PSS was increased. Furthermore, we employed a UV-visible spectrophotometer to examine the PEDOT:PSS sample following treatment with DBU. Our findings revealed an elevated absorption peak at 600 nm, indicative of the π-π* transition, and a diminished peak at 900 nm, associated with the polarization band. This observation provides evidence of a successful dedoping effect. By optimizing the thickness of the dedoped PEDOT:PSS layer, we successfully enhanced the power conversion efficiency (PCE) of Sn-Pb Perovskite Solar Cells (PSCs), achieving an impressive PCE value of 22.9%. Our findings present a promising avenue for the advancement of PSCs by fine-tuning the interface between hole transport materials and the perovskite layer, offering new possibilities for high-efficiency Sn-Pb PSCs and for all perovskite tandem PSCs.

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