Chemically suppressing redox reaction at the NiOx/perovskite interface in narrow bandgap perovskite solar cells to exceed a power conversion efficiency of 20%,Journal of Materials Chemistry A

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Chemically suppressing redox reaction at the NiOx/perovskite interface in narrow bandgap perovskite solar cells to exceed a power conversion efficiency of 20%
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2022-11-19 , DOI: 10.1039/d2ta06211a
Hongyu Bian _{1,

2} , Jiayu You ₁ , Cunyun Xu ₁ , Xiaofeng He _{1,

2} , Meng Wang ₃ , YanQing Yao ₄ , Wenqi Zeng _{1,

2} , Pengju Guo ₁ , Hongyu Zhou _{1,

2} , Dengcheng Lu ₁ , Zhongjun Dai _{1,

2} , Sam Zhang _{1,

2} , Qunliang Song ₁

Affiliation

NiO_x as a type of inorganic hole-transporting layer (HTL) material in narrow bandgap perovskite solar cells (NBG PSCs) showed exceptional stability but suffered a considerably poorer performance compared with NBG PSCs with commonly used PEDOT:PSS as the HTL. Herein, we found that redox reactions would occur at the interface between Ni³⁺ on the NiO_x surface and the easily oxidized Sn²⁺ in the perovskite, causing considerable non-radiative recombination centers. On this basis, we proposed a bifacial reduction strategy at the interface to boost the performance of NBG PSCs. By using a reductive reagent ascorbic acid to reduce the Ni³⁺/Ni²⁺ ratio on the surface of NiO_x beforehand, the possibility of contact between Ni³⁺ on the surface of NiO_x and perovskite is chemically reduced substantially, suppressing the redox reaction between them as well as the non-radiative recombination at the interface. By applying this strategy, the device's power conversion efficiency is elevated from 17.81% to 20.48%, with 91% remaining after 1128 hours of storage in a nitrogen-filled glovebox.

中文翻译：

化学抑制窄带隙钙钛矿太阳能电池中 NiOx/钙钛矿界面的氧化还原反应，使其功率转换效率超过 20%

NiO _x作为窄带隙钙钛矿太阳能电池 (NBG PSC) 中的一种无机空穴传输层 (HTL) 材料，表现出出色的稳定性，但与使用常用 PEDOT:PSS 作为 HTL 的 NBG PSC 相比，其性能要差得多。在此，我们发现在NiO _x^{表面的Ni 3+}和钙钛矿中易氧化的Sn ²⁺之间的界面处会发生氧化还原反应，从而产生大量的非辐射复合中心。在此基础上，我们提出了界面双面减少策略，以提高 NBG PSC 的性能。通过使用还原剂抗坏血酸降低NiO _x表面的Ni ³⁺ /Ni ^2+比值_{在此之前，NiO x}表面的Ni ³⁺与钙钛矿之间的化学接触可能性大大降低，抑制了它们之间的氧化还原反应以及界面处的非辐射复合。通过应用这一策略，该设备的功率转换效率从 17.81% 提高到 20.48%，在充满氮气的手套箱中存放 1128 小时后仍保持 91%。

更新日期：2022-11-19

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