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High-efficiency colorful perovskite solar cells using TiO2 nanobowl arrays as a structured electron transport layer

TiO2纳米碗阵列作为电子传输层构筑高效率彩色 钙钛矿太阳能电池


The rapid development of perovskite solar cells (PSCs) has stimulated great interest in the fabrication of colorful PSCs to meet the needs of aesthetic purposes in varied applications including building integrated photovoltaics and wearable electronics. However, it remains challenging to prepare high-efficiency PSCs with attractive colors using perovskites with broad optical absorption and large absorption coefficients. Here we show that high-efficiency PSCs exhibiting distinct structural colors can be readily fabricated by employing TiO2 nanobowl (NB) arrays as a nanostructured electron transport layer to integrate with a thin overlayer of perovskite on the NB arrays. A new crystalline precursor film based on lead acetate was prepared through a Lewis acid-base adduct approach, which allowed for the formation of a uniform overlayer of high-quality CH3NH3PbI3 crystals on the inner walls of the NBs. The PSCs fabricated using the TiO2 NB arrays showed angle-dependent vivid colors under light illumination. The resultant colorful PSCs exhibited a remarkable photovoltaic performance with a champion efficiency up to 16.94% and an average efficiency of 15.47%, which are record-breaking among the reported colorful PSCs.


钙钛矿太阳能电池的飞速发展及其在构筑一体化和可穿戴 器件中的应用前景激发了人们对于彩色钙钛矿太阳能电池的浓厚 兴趣, 但如何将可见光宽波段吸收且具有高吸光系数的钙钛矿材 料构筑成高性能的彩色太阳能电池仍是一个挑战. 本文利用TiO2 纳米碗阵列作为结构化的电子传输层, 并在纳米碗内均匀填充一层CH3NH3PbI3钙钛矿薄膜, 成功制备了具有鲜艳结构色的钙钛 矿@TiO2纳米碗阵列薄膜, 其结构色具有显著的角度依赖特征. 通 过路易斯酸碱加合物法制备得到基于醋酸铅的新型晶态中间体薄 膜, 使得高质量的CH3NH3PbI3钙钛矿薄膜能够在纳米碗内均匀填 充. 利用该钙钛矿@TiO2纳米碗薄膜可以制备出具有鲜艳结构色的 平面异质结钙钛矿太阳能电池, 其最高光电转化效率可以达到 16.94%, 平均效率达到15.47%, 均高于现已报道的彩色钙钛矿太阳 能电池的转化效率.


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This work was supported by the National Natural Science Foundation of China (21673007). The authors were grateful to Xue Zhou and Prof. Mingzhu Li for their kind help in the measurement of the reflection spectra of the perovskite@TiO2 NB array.

Author information




Qi L conceived the study. Wang W designed and performed the experiments. He Y participated in the materials preparation and data analysis. Wang W and Qi L wrote the manuscript. Qi L supervised the project. All authors contributed to the general discussion.

Corresponding author

Correspondence to Limin Qi.

Additional information

Wenhui Wang received her PhD degree in physical chemistry from Peking University under the supervision of Prof. Limin Qi in 2018. Currently, she is working at National University of Singapore as a research fellow. Her present research interests focus on the in-situ growth and assembly of metal nanoparticles using liquid cell TEM.

Limin Qi received his PhD degree from Peking University in 1998. He then went to the Max Planck Institute of Colloids and Interfaces as a postdoctoral fellow. In 2000, he joined the College of Chemistry at Peking University, where he has been a full professor since 2004. His research interests include colloidal chemistry, nanomaterials, self-assembly, energy-related materials, and biomimetic materials chemistry.

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Wang, W., He, Y. & Qi, L. High-efficiency colorful perovskite solar cells using TiO2 nanobowl arrays as a structured electron transport layer. Sci. China Mater. 63, 35–46 (2020).

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  • perovskite
  • solar cells
  • nanobowl arrays
  • structural color
  • nanostructures