Bulk In Situ Reconstruction of Heterojunction Perovskite Enabling Stable Solar Cells Over 24% Efficiency,Advanced Functional Materials

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Bulk In Situ Reconstruction of Heterojunction Perovskite Enabling Stable Solar Cells Over 24% Efficiency
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2023-10-17 , DOI: 10.1002/adfm.202310133
Shanyue Hou ₁ , Zhu Ma ₁ , Yanlin Li ₁ , Zhuowei Du ₁ , Yi Chen ₁ , Junbo Yang ₁ , Wei You ₁ , Qiang Yang ₁ , Tangjie Yu ₁ , Zhangfeng Huang ₁ , Guomin Li ₁ , Haoyu Wang ₁ , Qianyu Liu ₁ , Guangyuan Yan ₁ , Haimin Li ₁ , Yuelong Huang _{1,

2} , Wenhua Zhang ₃ , Mojtaba Abdi‐Jalebi ₄ , Zeping Ou ₅ , Kuan Sun ₅ , Rong Su ₆ , Wei Long ₆

Affiliation

Heterojunction perovskite solar cells combine the stability of 2D perovskites and the high efficiency of 3D perovskites, making them an excellent photovoltaic candidate. While heterojunctions with intermixed or gradient perovskites can reduce surface recombination, the aggregation and phase distribution of 2D perovskite induce transport losses, thereby limiting device fill factors. Accordingly, a bulk in situ reconstruction (BISR) strategy is proposed to induce the reconstruction of 3D perovskites on a minim self-assembled 2D crystal seed, forming heterojunction perovskite that runs through the entire active layer. This facilitates charge extraction, relieves tensile stress, and avoids the decomposition of perovskite on grain boundaries. As a result, the best-performing heterojunction perovskite solar cells show a high-power conversion efficiency (PCE) of 24.06% with 82.9% FF for the small-area device (0.105 cm²) and a superior PCE of 19.2% for the large-area module (5 × 5 cm²). Importantly, the unencapsulated device shows dramatically improved operational stability, maintaining 87% of its initial efficiency after 8000 h of storage under ambient atmosphere at room temperature. This work provides an effective and simple approach to establish heterojunction perovskite to simultaneously boost the efficiency and stability of PSCs.

中文翻译：

异质结钙钛矿的批量原位重建使太阳能电池的效率稳定超过 24%

异质结钙钛矿太阳能电池结合了2D钙钛矿的稳定性和3D钙钛矿的高效率，使其成为出色的光伏候选者。虽然混合或梯度钙钛矿的异质结可以减少表面复合，但二维钙钛矿的聚集和相分布会引起传输损失，从而限制器件填充因子。因此，提出了体原位重构（BISR）策略，以在最小自组装2D晶种上诱导3D钙钛矿的重构，形成贯穿整个有源层的异质结钙钛矿。这有利于电荷提取，减轻拉应力，并避免钙钛矿在晶界上的分解。因此，性能最佳的异质结钙钛矿太阳能电池在小面积器件（0.105 cm ²）中表现出 24.06% 的高功率转换效率（PCE）和 82.9% FF，在大面积器件中表现出 19.2% 的优异 PCE。 -面积模块（5 × 5 cm ²）。重要的是，未封装的器件显示出显着提高的运行稳定性，在室温下环境气氛下存储 8000 小时后仍保持其初始效率的 87%。这项工作提供了一种有效且简单的方法来建立异质结钙钛矿，以同时提高PSC的效率和稳定性。

更新日期：2023-10-17

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