Mesoporous SnO2 single crystals as an effective electron collector for perovskite solar cells

Zonglong Zhu; Xiaoli Zheng; Yang Bai; Teng Zhang; Zilong Wang; Shuang Xiao; Shihe Yang

doi:10.1039/c5cp01534k

Mesoporous SnO₂ single crystals as an effective electron collector for perovskite solar cells

Zonglong Zhu
, Xiaoli Zheng
, Yang Bai
, Teng Zhang
, Zilong Wang
, Shuang Xiao
, Shihe Yang^*

^*Corresponding author for this work

Hong Kong University of Science and Technology

Research output: Contribution to journal › Article › peer-review

90 Citations (Scopus)

Abstract

Mesoporous single crystals are prized for their fast electron transport and high surface area. Here we report the first synthesis of mesoporous SnO₂ single crystals (SnO₂ MSCs) by a simple silica-templated hydrothermal method, and its application in solution-processed perovskite solar cells (PSCs). A relatively low efficiency (3.76%) was obtained due to the strong charge recombination at the SnO₂/perovskite interface. However, by coating a thin TiO₂ barrier layer on SnO₂via TiCl₄ treatment, we were able to achieve an 8.54% power conversion efficiency (PCE). A dynamics study using impedance spectroscopy revealed a much lower transport resistance for the SnO₂ MSC-based solar cells than for the TiO₂ nanocrystal PSCs, but a stronger recombination. Significantly, the thin TiO₂ coating layer on SnO₂ considerably reduced the recombination while largely maintaining the superior electron-transport properties.

Original language	English
Pages (from-to)	18265-18268
Number of pages	4
Journal	Physical Chemistry Chemical Physics
Volume	17
Issue number	28
DOIs	https://doi.org/10.1039/c5cp01534k
Publication status	Published - 28 Jul 2015
Externally published	Yes

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title = "Mesoporous SnO2 single crystals as an effective electron collector for perovskite solar cells",

abstract = "Mesoporous single crystals are prized for their fast electron transport and high surface area. Here we report the first synthesis of mesoporous SnO2 single crystals (SnO2 MSCs) by a simple silica-templated hydrothermal method, and its application in solution-processed perovskite solar cells (PSCs). A relatively low efficiency (3.76\%) was obtained due to the strong charge recombination at the SnO2/perovskite interface. However, by coating a thin TiO2 barrier layer on SnO2via TiCl4 treatment, we were able to achieve an 8.54\% power conversion efficiency (PCE). A dynamics study using impedance spectroscopy revealed a much lower transport resistance for the SnO2 MSC-based solar cells than for the TiO2 nanocrystal PSCs, but a stronger recombination. Significantly, the thin TiO2 coating layer on SnO2 considerably reduced the recombination while largely maintaining the superior electron-transport properties.",

author = "Zonglong Zhu and Xiaoli Zheng and Yang Bai and Teng Zhang and Zilong Wang and Shuang Xiao and Shihe Yang",

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T1 - Mesoporous SnO2 single crystals as an effective electron collector for perovskite solar cells

AU - Zhu, Zonglong

AU - Zheng, Xiaoli

AU - Bai, Yang

AU - Zhang, Teng

AU - Wang, Zilong

AU - Xiao, Shuang

AU - Yang, Shihe

PY - 2015/7/28

Y1 - 2015/7/28

N2 - Mesoporous single crystals are prized for their fast electron transport and high surface area. Here we report the first synthesis of mesoporous SnO2 single crystals (SnO2 MSCs) by a simple silica-templated hydrothermal method, and its application in solution-processed perovskite solar cells (PSCs). A relatively low efficiency (3.76%) was obtained due to the strong charge recombination at the SnO2/perovskite interface. However, by coating a thin TiO2 barrier layer on SnO2via TiCl4 treatment, we were able to achieve an 8.54% power conversion efficiency (PCE). A dynamics study using impedance spectroscopy revealed a much lower transport resistance for the SnO2 MSC-based solar cells than for the TiO2 nanocrystal PSCs, but a stronger recombination. Significantly, the thin TiO2 coating layer on SnO2 considerably reduced the recombination while largely maintaining the superior electron-transport properties.

AB - Mesoporous single crystals are prized for their fast electron transport and high surface area. Here we report the first synthesis of mesoporous SnO2 single crystals (SnO2 MSCs) by a simple silica-templated hydrothermal method, and its application in solution-processed perovskite solar cells (PSCs). A relatively low efficiency (3.76%) was obtained due to the strong charge recombination at the SnO2/perovskite interface. However, by coating a thin TiO2 barrier layer on SnO2via TiCl4 treatment, we were able to achieve an 8.54% power conversion efficiency (PCE). A dynamics study using impedance spectroscopy revealed a much lower transport resistance for the SnO2 MSC-based solar cells than for the TiO2 nanocrystal PSCs, but a stronger recombination. Significantly, the thin TiO2 coating layer on SnO2 considerably reduced the recombination while largely maintaining the superior electron-transport properties.

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JF - Physical Chemistry Chemical Physics

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ER -

Mesoporous SnO₂ single crystals as an effective electron collector for perovskite solar cells

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