Strain-induced rubidium incorporation into wide-bandgap perovskites reduces photovoltage loss

IF 44.7 1区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Science Pub Date : 2025-04-03 DOI:10.1126/science.adt3417

Likai Zheng, Mingyang Wei, Felix T. Eickemeyer, Jing Gao, Bin Huang, Ummugulsum Gunes, Pascal Schouwink, David Wenhua Bi, Virginia Carnevali, Mounir Mensi, Francesco Biasoni, Yuxuan Zhang, Lorenzo Agosta, Vladislav Slama, Nikolaos Lempesis, Michael A. Hope, Shaik M. Zakeeruddin, Lyndon Emsley, Ursula Rothlisberger, Lukas Pfeifer, Yimin Xuan, Michael Grätzel

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Abstract

A-site cation mixing can enhance the photovoltaic performance of a wide-bandgap (WBG) perovskite, but rubidium (Rb) cation mixing generally forms a nonperovskite phase. We report that lattice strain locks Rb ions into the α-phase of the lattice of a triple-halide WBG perovskite, preventing phase segregation into a nonperovskite Rb-cesium–rich phase. This process cooperates with chloride accommodation and promotes halide homogenization across the entire film volume. The resulting 1.67–electron volt WBG perovskite exhibits photoluminescence quantum yields exceeding 14% under 1-sun-equivalent irradiation, corresponding to a quasi–Fermi level splitting of ~1.34 electron volts. A WBG perovskite solar cell with an open-circuit voltage (V_OC) of 1.30 volts was prepared, corresponding to 93.5% of the radiative V_OC limit and representing the lowest photovoltage loss relative to the theoretical limit observed in WBG perovskites.

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应变诱导铷掺入到宽带隙钙钛矿中可降低光电压损失

a位阳离子混合可以增强宽带隙（WBG）钙钛矿的光伏性能，但铷（Rb）阳离子混合通常形成非钙钛矿相。我们报道，晶格应变将Rb离子锁定在三卤化物WBG钙钛矿晶格的α-相中，防止相偏析成非钙钛矿富铷-铯相。这一过程与氯化物调节配合，促进了卤化物在整个薄膜体积上的均匀化。得到的1.67电子伏特WBG钙钛矿在1太阳当量照射下的光致发光量子产率超过14%，对应于~1.34电子伏特的准费米能级分裂。制备的WBG钙钛矿太阳能电池开路电压（VOC）为1.30伏，相当于辐射VOC限值的93.5%，相对于WBG钙钛矿的理论限值，光电压损失最低。

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来源期刊

Science 综合性期刊-综合性期刊

CiteScore

61.10

自引率

0.90%

发文量

审稿时长

2.1 months

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