Self-assembly construction of a homojunction of Sn–Pb perovskite using an antioxidant for all-perovskite tandem solar cells with improved efficiency and stability,Energy & Environmental Science

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Self-assembly construction of a homojunction of Sn–Pb perovskite using an antioxidant for all-perovskite tandem solar cells with improved efficiency and stability
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2024-07-23 , DOI: 10.1039/d4ee01539h
Zhuojia Lin ₁ , Jianwei Chen ₁ , Chenghao Duan ₁ , Kezhou Fan ₂ , Jiong Li ₁ , Shibing Zou ₁ , Feilin Zou ₁ , Ligang Yuan ₃ , Zheng Zhang ₁ , Kaicheng Zhang ₄ , Man Yu Lam ₂ , Sergeev A. Aleksandr ₂ , Jianhang Qiu ₅ , Kam Sing Wong ₂ , He Yan ₆ , Keyou Yan ₁

Affiliation

All-perovskite tandem solar cells (PTSCs) demonstrate higher power conversion efficiency (PCE) and lower levelized cost of electricity than single-junction perovskite solar cells (PSCs). However, narrow bandgap (NBG) sub-cells with a Sn–Pb alloy cause severe p-type self-doping by surface oxidized Sn⁴⁺ to generate substantial energy loss and device degradation. Here, we developed a one-step self-assembly strategy to construct a p/p⁻ homojunction of Sn–Pb perovskite using the antioxidant 4-trifluoromethylphenylhydrazine hydrochloride (TFPHCl) and prepared highly efficient and stable NBG PSCs. Self-floating TFPH cations allowed effective defect passivation and inhibition of Sn²⁺–Sn⁴⁺ oxidation, leading to a weak p-type surface (p⁻). Hence, the as-formed p/p⁻ homojunction in turn accelerated the charge separation and reduced the non-radiative recombination. TFPHCl-modified NBG PSCs reached a stabilized PCE of 23.09% with an open-circuit voltage (V_oc) of 0.88 V and excellent operational stability over 780 hours. Coupled with wide bandgap (WBG) subcells, TFPHCl-modified PTSCs ultimately attained an optimal PCE of 27.42% with long-term operational stability over 450 hours.

中文翻译：

使用抗氧化剂自组装构建 Sn-Pb 钙钛矿同质结，用于全钙钛矿串联太阳能电池，提高效率和稳定性

与单结钙钛矿太阳能电池（PSC）相比，全钙钛矿串联太阳能电池（PTSC）表现出更高的功率转换效率（PCE）和更低的平准化电力成本。然而，具有 Sn-Pb 合金的窄带隙 (NBG) 子电池会因表面氧化的 Sn ⁴⁺导致严重的 p 型自掺杂，从而产生大量的能量损失和器件退化。在这里，我们开发了一种一步自组装策略，使用抗氧化剂4-三氟甲基苯肼盐酸盐（TFPHCl）构建Sn-Pb钙钛矿的p/ ^p-同质结，并制备了高效、稳定的NBG PSC。自漂浮的 TFPH 阳离子可以有效钝化缺陷并抑制 Sn ²⁺ –Sn ⁴⁺氧化，从而形成弱 p 型表面 (p ⁻ )。因此，所形成的p/ ^p-同质结反过来加速了电荷分离并减少了非辐射复合。 TFPHCl 修饰的 NBG PSC 达到了 23.09% 的稳定 PCE，开路电压 ( V _oc ) 为 0.88 V，并且在 780 小时内具有出色的运行稳定性。与宽带隙 (WBG) 子电池相结合，TFPHCl 修饰的 PTSC 最终获得了 27.42% 的最佳 PCE，并具有超过 450 小时的长期运行稳定性。

更新日期：2024-07-23

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