Perovskite silicon tandem solar cells are a promising technology to overcome the efficiency limit of silicon solar cells. Although highest tandem efficiencies have been reported for the inverted p‐i‐n structure, high‐efficiency single junction perovskite solar cells are mostly fabricated in the regular n‐i‐p architecture. In this work, regular n‐i‐p perovskite solar cells with a high‐bandgap mixed cation mixed halide absorber suitable for tandem solar cells are investigated by compositional engineering and the open‐circuit voltage is improved to over 1.12 V using a passivating electron contact. The optimized perovskite solar cell is used as a top cell in a monolithic perovskite silicon tandem device with a silicon heterojunction bottom cell allowing for voltages up to 0.725 V. The tandem solar cells with an active area of 0.25 cm² achieve record open‐circuit voltages of up to 1.85 V and have efficiencies over 20%. Analyzing the perovskite absorber by spatially resolved photoluminescence measurements shows a homogenous and stable emission at ~ 1.7 eV which is an optimal value for tandem applications with silicon. The tandem solar cells are mainly limited due to a low current. A spectrometric characterization reveals that the perovskite solar cell is current limiting which could be improved by a thicker perovskite absorber.

中文翻译：

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具有高带隙钙钛矿吸收器的两端钙钛矿硅串联太阳能电池，可提供超过1.8 V的电压

钙钛矿型硅串联太阳能电池是克服硅太阳能电池效率极限的一项有前途的技术。尽管据报导倒置p-i-n结构的串联效率最高，但高效单结钙钛矿太阳能电池大多采用常规n-i-p结构制造。在这项工作中，常规n‐i‐p通过组成工程研究了具有高能隙混合阳离子混合卤化物吸收剂的钙钛矿型太阳能电池，适用于串联式太阳能电池，并通过钝化电子触点将开路电压提高到1.12 V以上。经过优化的钙钛矿太阳能电池用作整体式钙钛矿硅串联设备的顶部电池，硅异质结底部电池允许电压高达0.725V。串联太阳能电池的有效面积为0.25 cm ²达到创纪录的高达1.85 V的开路电压，效率超过20％。通过空间分辨的光致发光测量分析钙钛矿吸收剂显示出均匀且稳定的发射约为1.7 eV，这是与硅串联应用的最佳值。串联太阳能电池主要由于低电流而受到限制。光谱表征表明钙钛矿太阳能电池是限流的，这可以通过较厚的钙钛矿吸收剂来改善。