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The strong aggregation tendency of hole transport material poly[3-(4-carboxylbutyl) thiophene-K (P3CT-K) restricts its further application in inverted perovskite solar cells (PSCs). Here, we report an effective strategy to address this issue and achieve the superior performance of inverted methylammonium lead triiodide (MAPbI3) PSCs, in which graphdiyne oxide (GDYO) doped P3CT-K nanocomposites are applied as the hole transport nanolayer (HTL). It is revealed that the strong π–π stacking interaction occurs between GDYO and P3CT-K, which is proved by the blue shift of the absorption peak of P3CT-K nanolayer. The aggregation control via GDYO contributes to the property improvement of P3CT-K HTL. Moreover, the homogeneous coverage induces the growth of perovskite grain with larger size than that based on the undoped one. As a result, the optimized surface morphology, enhanced conductivity, charge extraction as well as better crystal quality, finally improve the device performance. An optimal power conversion efficiency of 19.06% is achieved, with simultaneously improved fill factor and short circuit current density. This work presents the potential of functional graphdiyne (GDY) in the development of highly efficient photovoltaic device.

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Publication history

Received: 10 December 2021
Revised: 22 January 2022
Accepted: 24 January 2022
Published: 02 March 2022
Issue date: November 2022

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© Tsinghua University Press 2022

Acknowledgements

Acknowledgements

This work was supported by the National Natural Science Foundation of China (No. 21975273), Scientific Research Starting Foundation of Outstanding Young Scholar of Shandong University, and the Fundamental Research Funds of Shandong University. We thank Guangdong Basic and Applied Basic Research Foundation (No. 2019A1515012156), 2020 Li Ka Shing Foundation Cross Disciplinary Research Grant (No. 2020LKSFG01A), and Department of Education of Guangdong Province (Nos. 2021LSYS009 and 2021KCXTD032).

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Email: nanores@tup.tsinghua.edu.cn

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