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

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  • ReceivedMay 31, 2019
  • AcceptedJun 3, 2019
  • PublishedJul 2, 2019

Abstract

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.


Funded by

the National Natural Science Foundation of China(21673007)


Acknowledgment

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.


Interest statement

The authors declare that they have no conflict of interest.


Contributions statement

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.


Author 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.


Supplement

Supplementary information

Supporting data are available in the online version of the paper.


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