Improvement of interfacial electron extraction efficiency by suppressing Auger recombination in an indium-doped mixed cationic perovskite heterostructure

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science Pub Date : 2024-11-17 DOI:10.1016/j.apsusc.2024.161819

Gaofang Li, Chenguang Huang, Xiaolin Liu, Yanan Wang, Jia Lin, Chen Wang, Xian Lin, Guohong Ma, Zhiming Huang, Junhao Chu

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Abstract

The electron extraction of indium (In³⁺)-doped mixed cationic perovskite heterostructure, SnO₂/Cs_0.05(MA_0.17FA_0.83)_0.95Pb(I_0.83Br_0.17)₃:In³⁺ (SnO₂/M:In³⁺), is explored by optical pump-terahertz (THz) probe technology. The difference of the conductivity maxima (Δσ_dm) of M and SnO₂/M is used to calculate the electron extraction efficiency of SnO₂/M with photoexcited carrier density of 2.66 × 10¹⁸ ∼ 1.33 × 10¹⁹ cm⁻³, which are 33.14 %, 32.01 %, 31.17 %, −3.73 %, and –23.66 %, respectively. The negative electron extraction efficiency of SnO₂/M with photoexcited carrier density from 1.06 × 10¹⁸ to 1.33 × 10¹⁹ cm⁻³ is caused by the extraction of electrons from SnO₂ into M. For SnO₂/M:In³⁺, electron extraction efficiencies are 51.76 %, 52.68 %, 49.51 %, 48.03.% and 48.03 % with photoexcited carrier density increased from 2.66 × 10¹⁸ cm⁻³ to1.33 × 10¹⁹ cm⁻³, respectively, which are all positive and about 20 % higher than that of SnO₂/M, related to the suppression of Auger recombination and super-injection phenomenon by In³⁺ doping. The insights of this investigation provide important experimental data and theoretical basis for design and production of efficient perovskite solar cells.

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通过抑制掺铟混合阳离子包晶异质结构中的奥杰尔重组提高界面电子萃取效率

利用光泵-太赫兹（THz）探针技术探讨了掺杂铟（In3+）的混合阳离子包晶异质结构 SnO2/Cs0.05(MA0.17FA0.83)0.95Pb(I0.83Br0.17)3:In3+（SnO2/M:In3+）的电子萃取。在光激发载流子密度为 2.66 × 1018 ∼ 1.33 × 1019 cm-3 时，利用 M 和 SnO2/M 的最大电导率差值（Δσdm）计算 SnO2/M 的电子萃取效率，其值分别为 33.14 %、32.01 %、31.17 %、-3.73 % 和 -23.66 %。对于 SnO2/M:In3+，光激发载流子密度从 1.06 × 1018 cm-3 到 1.33 × 1019 cm-3 时的电子萃取效率分别为 51.76 %、52.68 %、49.51 %、48.03 % 和 48.03 %。随着光激发载流子密度从 2.66 × 1018 cm-3 增加到 1.33 × 1019 cm-3，电子萃取效率分别为 51.76 %、52.68 %、49.51 %、48.03 % 和 48.03 %，均为正值，比 SnO2/M 的电子萃取效率高约 20%，这与 In3+ 掺杂抑制了奥杰尔重组和超注入现象有关。这项研究的启示为设计和生产高效的过氧化物太阳能电池提供了重要的实验数据和理论依据。

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来源期刊

Applied Surface Science 工程技术-材料科学：膜

CiteScore

12.50

自引率

7.50%

发文量

3393

审稿时长

67 days

期刊介绍： Applied Surface Science covers topics contributing to a better understanding of surfaces, interfaces, nanostructures and their applications. The journal is concerned with scientific research on the atomic and molecular level of material properties determined with specific surface analytical techniques and/or computational methods, as well as the processing of such structures.