揭示高效钙钛矿太阳能电池中埋藏电荷选择异质界面的电荷转移动力学

IF 4.8 2区 化学 Q2 CHEMISTRY, PHYSICAL
Di Li, Shaobing Xiong, Bo Peng, Weimin Liu*, Bo Li* and Qinye Bao*, 
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引用次数: 0

摘要

钙钛矿和电荷传输层之间的异质界面上的次优载流子动力学严重限制了最先进的钙钛矿太阳能电池(PSCs)的进一步性能提高。在此,我们通过超快瞬态技术完整地绘制了埋藏电子选择异质界面在宽时间范围内的载流子提取和重组动力学。结果表明,异质界面包含了钙钛矿在~ 2.8 ps内产生自由电荷的电子过程、阱态诱导电子捕获小于~ 10.0 ps的弛豫过程、钙钛矿在~ 194 ps内向SnO2的电子提取过程、阱辅助复合过程在~ 2047 ps内以及回注电子与剩余空穴在~ 8.4 ns内的复合过程。此外,我们进一步证明,插入的聚乙烯醇(PVA)薄层可以有效地增强钙钛矿向SnO2的电子提取,阻止不希望的电子回注,并显著抑制非辐射复合,有助于提高器件的光电压和填充因子参数。本研究揭示了钙钛矿埋藏异质界面的电荷转移限制,为设计理想的异质界面促进电荷转移和提高PSC性能提供了有效的指导。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Revealing Charge-Transfer Dynamics at Buried Charge-Selective Heterointerface in Highly Effective Perovskite Solar Cells

Revealing Charge-Transfer Dynamics at Buried Charge-Selective Heterointerface in Highly Effective Perovskite Solar Cells

The suboptimal carrier dynamics at the heterointerface between the perovskite and charge transport layer severely limit further performance enhancement of the state-of-the-art perovskite solar cells (PSCs). Herein, we completely map charge carrier extraction and recombination kinetics over a broad time range at buried electron-selective heterointerfaces via ultrafast transient technologies. It is revealed that the heterointerfaces carefully contain the electronic processes of free charge generation in perovskite within ∼2.8 ps, relaxation process of trap-state induced electron capturing less than ∼10.0 ps, electron extraction from perovskite to SnO2 within ∼194 ps, trap-assisted recombination within ∼2047 ps, and recombination between back-injected electrons and remaining holes within ∼8.4 ns. Moreover, we further demonstrate that the inserted poly(vinyl alcohol) (PVA) thin layer can effectively enhance the electron extraction from perovskite to SnO2, block the undesired electron back injection, and significantly suppress the nonradiative recombination, contributing to the improved device parameters of photovoltage and fill factor. This work sheds light on charge-transfer limitations at the perovskite buried heterointerface and provides an effective guide of ideal heterointerface design for promoting charge transfer and improving PSC performance.

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来源期刊
The Journal of Physical Chemistry Letters
The Journal of Physical Chemistry Letters CHEMISTRY, PHYSICAL-NANOSCIENCE & NANOTECHNOLOGY
CiteScore
9.60
自引率
7.00%
发文量
1519
审稿时长
1.6 months
期刊介绍: The Journal of Physical Chemistry (JPC) Letters is devoted to reporting new and original experimental and theoretical basic research of interest to physical chemists, biophysical chemists, chemical physicists, physicists, material scientists, and engineers. An important criterion for acceptance is that the paper reports a significant scientific advance and/or physical insight such that rapid publication is essential. Two issues of JPC Letters are published each month.
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