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ACS Nano. 2017 Sep 26;11(9):9176-9182. doi: 10.1021/acsnano.7b04070. Epub 2017 Sep 6.

Enhanced Electronic Properties of SnO2 via Electron Transfer from Graphene Quantum Dots for Efficient Perovskite Solar Cells.

Author information

1
State Key Laboratory of Silicon Materials and School of Materials Science and Engineering, Zhejiang University , Hangzhou 310027, China.
2
Center for Optoelectronics Materials and Devices, Department of Physics, Zhejiang Sci-Tech University , Hangzhou 310018, China.

Abstract

Tin dioxide (SnO2) has been demonstrated as an effective electron-transporting layer (ETL) for attaining high-performance perovskite solar cells (PSCs). However, the numerous trap states in low-temperature solution processed SnO2 will reduce the PSCs performance and result in serious hysteresis. Here, we report a strategy to improve the electronic properties in SnO2 through a facile treatment of the films with adding a small amount of graphene quantum dots (GQDs). We demonstrate that the photogenerated electrons in GQDs can transfer to the conduction band of SnO2. The transferred electrons from the GQDs will effectively fill the electron traps as well as improve the conductivity of SnO2, which is beneficial for improving the electron extraction efficiency and reducing the recombination at the ETLs/perovskite interface. The device fabricated with SnO2:GQDs could reach an average power conversion efficiency (PCE) of 19.2 ± 1.0% and a highest steady-state PCE of 20.23% with very little hysteresis. Our study provides an effective way to enhance the performance of perovskite solar cells through improving the electronic properties of SnO2.

KEYWORDS:

electron transfer; electron traps; graphene quantum dots; perovskite solar cells; tin dioxide

PMID:
28858471
DOI:
10.1021/acsnano.7b04070

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