<br>通过掺杂 n 型聚合物最大限度地减少 PCBM 的能级失配和表面钝化，以获得高度稳定的 Sn 基钙钛矿太阳能电池,Small

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通过掺杂 n 型聚合物最大限度地减少 PCBM 的能级失配和表面钝化，以获得高度稳定的 Sn 基钙钛矿太阳能电池
Small ( IF 13.0 ) Pub Date : 2024-06-19 , DOI: 10.1002/smll.202402896
Md Emrul Kayesh ₁ , Md Abdul Karim ₁ , Yulu He ₁ , Yasuhiro Shirai ₂ , Masatoshi Yanagida ₂ , Ashraful Islam ₁

Affiliation

由于 Sn²⁺ 氧化的固有趋势以及钙钛矿与苯基 C61-丁酸甲酯（PCBM）之间的巨大能量错配，开发高性能和稳定的 Sn 基钙钛矿太阳能电池（PSC）很困难，PCBM 是一种经常使用的电子传递层（ETL）。本研究表明，通过将 n 型聚合物 N2200 掺杂到 PCBM 中，可以钝化钙钛矿表面缺陷并改善 PCBM 的电性能。用 N2200 掺杂 PCBM 可增强能带对准并改善 PCBM 的电性能。N2200 中存在 S 和 O 等供电子原子，可有效地与游离 Sn²⁺ 配位，以防止进一步氧化。使用 N2200 对 PCBM 进行掺杂，可在 ETL 和钙钛矿之间的界面处减少导带偏移（从 0.38 到 0.21 eV）。因此，基于 N2200 掺杂 PCBM 的 PSC 显示出 0.79 V 的增强开路电压，具有令人印象深刻的 12.98% 的功率转换效率（PCE）（认证 PCE 11.95%）。值得注意的是，N2200 掺杂的基于 PCBM 的 PSC 表现出优异的稳定性，并且在一个阳光下以最大功率点跟踪连续照明 1000 小时时，保留了其初始 PCE 的 90% 以上。

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Minimization of Energy Level Mismatch of PCBM and Surface Passivation for Highly Stable Sn-Based Perovskite Solar Cells by Doping n-Type Polymer

Developing high-performance and stable Sn-based perovskite solar cells (PSCs) is difficult due to the inherent tendency of Sn²⁺ oxidation and, the huge energy mismatch between perovskite and Phenyl-C61-butyric acid methyl ester (PCBM), a frequently employed electron transport layer (ETL). This study demonstrates that perovskite surface defects can be passivated and PCBM's electrical properties improved by doping n-type polymer N2200 into PCBM. The doping of PCBM with N2200 results in enhanced band alignment and improved electrical properties of PCBM. The presence of electron-donating atoms such as S, and O in N2200, effectively coordinates with free Sn²⁺ to prevent further oxidation. The doping of PCBM with N2200 offers a reduced conduction band offset (from 0.38 to 0.21 eV) at the interface between the ETL and perovskite. As a result, the N2200 doped PCBM-based PSCs show an enhanced open circuit voltage of 0.79 V with impressive power conversion efficiency (PCE) of 12.98% (certified PCE 11.95%). Significantly, the N2200 doped PCBM-based PSCs exhibited exceptional stability and retained above 90% of their initial PCE when subjected to continuous illumination at maximum power point tracking for 1000 h under one sun.

更新日期：2024-06-19

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