Article Title

Performance enhancement of perovskite-sensitized mesoscopic solar cells using Nb-doped TiO₂ compact layer

Authors

Xiong Yin, CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology, Beijing 100190, China
Yanjun Guo, CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology, Beijing 100190, China
Zhaosheng Xue, Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore 117576, Singapore
Peng Xu, CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology, Beijing 100190, China
Meng He, CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology, Beijing 100190, China
Bin Liu, Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore 117576, Singapore

Keywords

perovskite solar cell, dense film, spraying pyrolysis deposition, Nb-doped TiO2 compact layer, impedance spectroscopy

Abstract

Perovskite solar cells are one of the most promising alternatives to conventional photovoltaic devices, and extensive studies are focused on device optimization to further improve their performance. A compact layer of TiO2 is generally used in perovskite solar cells to block holes from reaching the fluorine-doped tin oxide electrode. In this contribution, we engineered a TiO2 compact layer using Nb doping, which resulted in solar cells with a power conversion efficiency (PCE) of 10.26%, which was higher than that of devices with the same configuration but containing a pristine TiO2 compact layer (PCE = 9.22%). The device performance enhancement was attributed to the decreased selective contact resistance and increased charge recombination resistance resulting from Nb doping, which was revealed by the impedance spectroscopy measurements. The developed strategy highlights the importance of interface optimization for perovskite solar cells.

Graphical Abstract

DOI

https://doi.org/10.1007/s12274-015-0711-4

Publisher

Tsinghua University Press

Recommended Citation

Xiong Yin,Yanjun Guo,Zhaosheng Xue,Peng Xu,Meng He,Bin Liu, Performance enhancement of perovskite-sensitized mesoscopic solar cells using Nb-doped TiO2 compact layer. NanoRes.2015, 8(6): 1997–2003