Solid–solid chemical bonding featuring targeted defect passivation for efficient perovskite photovoltaics,Energy & Environmental Science

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Solid–solid chemical bonding featuring targeted defect passivation for efficient perovskite photovoltaics
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2022-12-01 , DOI: 10.1039/d2ee02732a
Chao Luo ₁ , Guanhaojie Zheng _{2,

3,

4} , Xianjin Wang ₁ , Feng Gao ₁ , Changling Zhan ₁ , Xingyu Gao _{2,

3,

4} , Qing Zhao _{1,

5,

6}

Affiliation

Solution-processed surface defect passivation has enabled perovskite solar cells (PSCs) to make remarkable progress in recent years. Here, different from solution processing, we proposed solvent-free solid-phase passivation (SPP) to bond surface uncoordinated Pb²⁺ defects using passivator molecules on pre-prepared solid-state films. The attentively selected passivator was found to anchor on the defect sites of the perovskite film surface even if the passivator film was removed, due to its strong coordination ability with the uncoordinated Pb²⁺ defects. This unique targeted defect passivation substantially reduces the carrier non-radiative recombination loss, delivering a high V_OC of 1.20 V (voltage loss is only 0.34 V). Consequently, the power conversion efficiency (PCE) of PSCs was greatly improved from 22.37% to certified 24.65%. The 1 cm² SPP-based PSC also exhibited a high PCE exceeding 23%. Moreover, the unencapsulated PSCs maintain 98% and 92% of their initial efficiency after storage under nitrogen for 2300 h and tracking at a maximum power point for 800 h.

中文翻译：

具有针对高效钙钛矿光伏器件的靶向缺陷钝化的固-固化学键合

近年来，溶液处理的表面缺陷钝化使钙钛矿太阳能电池（PSC）取得了显着进步。在这里，与溶液处理不同，我们提出了无溶剂固相钝化 (SPP)，以在预先制备的固态薄膜上使用钝化剂分子结合表面未配位的 Pb ^2+缺陷。^{精心挑选的钝化剂由于与未配位的 Pb 2+}缺陷具有很强的配位能力，即使去除了钝化膜，也能锚定在钙钛矿膜表面的缺陷位点上。这种独特的靶向缺陷钝化显着降低了载流子非辐射复合损耗，提供高V _OC1.20 V（电压损失仅为 0.34 V）。因此，PSC 的功率转换效率 (PCE) 从 22.37% 大幅提高到经认证的 24.65%。基于 1 cm ² SPP 的 PSC 也表现出超过 23% 的高 PCE。此外，未封装的 PSC 在氮气下储存 2300 小时并在最大功率点跟踪 800 小时后保持其初始效率的 98% 和 92%。

更新日期：2022-12-02

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