Resolving the Hydrophobicity of the Me-4PACz Hole Transport Layer for Inverted Perovskite Solar Cells with Efficiency >20%

被引：75
作者：
Hossain, Kashimul [1 ]
Kulkarni, Ashish [5 ]
Bothra, Urvashi [1 ]
Klingebiel, Benjamin [2 ]
Kirchartz, Thomas [2 ,3 ,4 ]
Saliba, Michael [5 ,6 ]
Kabra, Dinesh [1 ]
机构：
[1] Indian Inst Technol Bombay Powai, Dept Phys, Mumbai 400076, India
[2] Forschungszentrum Julich, IEK5 Photovolta, D-52428 Julich, Germany
[3] Univ Duisburg Essen, Fac Engn, D-47057 Duisburg, Germany
[4] Univ Duisburg Essen, CENIDE, D-47057 Duisburg, Germany
[5] Forschungszentrum Julich, Helmholtz Young Investigator Grp FRONTRUNNER, IEK5 Photovolta, D-52428 Julich, Germany
[6] Univ Stuttgart, Inst Photovolta IPV, D-70569 Stuttgart, Germany
来源：
ACS ENERGY LETTERS | 2023年 / 8卷 / 09期
基金：
欧盟地平线“2020”; 欧洲研究理事会;
关键词：
POLYMER; EXCITON; BINDING; ENERGY; LENGTH; YIELD;
D O I：
10.1021/acsenergylett.3c01385
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
A [4-(3,6-dimethyl-9H-carbazol-9-yl)butyl]phosphonic acid (Me-4PACz) self-assembled monolayer (SAM) has been employed in perovskite devices demonstrating high efficiencies. However, a uniform perovskite layer does not form due to the hydrophobicity of Me-4PACz. Here, we tackle this challenge by adding a conjugated polyelectrolyte, poly(9,9-bis(3 '-(N,N-dimethyl)-N-ethylammonium-propyl-2,7-fluorene)-alt-2,7-(9,9-dioctylfluorene)) dibromide (PFN-Br), to the Me-4PACz in a specific ratio, defined as Pz:PFN. With this mixing engineering strategy using Pz:PFN, the PFN-Br interaction with the A-site cation is confirmed via solution-state nuclear magnetic resonance studies. The narrow full widths at half-maxima of diffraction peaks and photoluminescence spectra of perovskite films reveal improved crystallization at the optimal mixing ratio of Pz:PFN. Interestingly, the mixing of PFN-Br additionally tunes the work function of the Me-4PACz and the built-in voltage in the solar cells. Devices employing the optimized Pz:PFN mixing ratio deliver an open-circuit voltage of 1.16 V and efficiency >20% for perovskites with a bandgap of 1.6 eV with high reproducibility and concomitant stability.
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页码：3860 / 3867
页数：8
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