Bifunctional Dye Molecule in All‐Inorganic CsPbIBr2 Perovskite Solar Cells with Efficiency Exceeding 10%. Issue 9 (5th July 2019)

• Record Type: Journal Article
• Authors: Yang, Shuzhang; Guo, Zhanglin; Gao, Liguo; Yu, Fengyang; Zhang, Chu; Fan, Meiqiang; Wei, Guoying; Ma, Tingli
• Is Part Of: Solar RRL. Volume 3:Issue 9(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-07-05
• Subjects: CsPbIBr2 -- broaden absorption spectra -- inorganic perovskite solar cells -- interface passivation; Solar energy -- Periodicals; Photovoltaic power generation -- Periodicals; Solar energy -- Research -- Periodicals; Photovoltaic power generation -- Research -- Periodicals; Periodicals; 333.7923
• DOI: 10.1002/solr.201900212
• Languages: English
• ISSNs: 2367-198X

Abstract

Abstract : Inorganic lead halide perovskites are attracting increasing attention due to their much better thermal stability than the organic–inorganic hybrid perovskite materials. Thus, the low power conversion efficiency (PCE) is a key issue for the inorganic lead halide perovskite solar cells (PSCs). This is mainly due to their wider bandgap and larger energy loss ( E loss ) in the devices. Herein, for solving this issue, a dye molecule‐assisted engineering using the dye of 5, 15‐bis(2, 6‐dioctoxyphenyl)‐10‐(bis(4‐hexylphenyl)‐amino‐20‐4‐carboxyphenylethynyl)porphyrinato]zinc(II) (YD2 ‐o‐C8) is demonstrated. Results indicate that this molecule has a bifunctional effect, not only as a co‐sensitization layer for CsPbIBr2 with broader absorption spectrum but also reduces the E loss by interface passivation. Specifically, the light absorption range of the photoactive layer is broadened from 600 to nearly 680 nm. At the same time, the interfacial charge recombination is highly reduced. After optimizing, the champion PCE is enhanced from 7.02% to 10.13%, and record‐high open‐circuit voltage ( V OC ) of 1.37 V and short‐circuit currents ( J SC ) of 12.05 mA cm −2 are achieved. This study opens a simple and efficient way to improve the efficiency of inorganic PSCs. Abstract : A bifunctional dye molecule, 5, 15‐bis(2, 6‐dioctoxyphenyl)‐10‐(bis(4‐hexylphenyl)‐amino‐20‐4‐carboxyphenylethynyl)porphyrinato]zinc(II) (YD2 ‐o‐C8), is introduced into CsPbI2 Br PSCs. It not only broadens the light absorption range of the perovskite but also reduces the energy loss ( E loss ) by interface passivation. As a result, the efficiency markedly enhances from 7.02% to 10.13%, featuring a short‐circuit current ( J SC ) of 12.05 mA cm −2 and a record‐high open‐circuit voltage ( V OC ) of 1.37 V.