Low-Temperature Synthesized Nb-Doped TiO2 Electron Transport Layer Enabling High-Efficiency Perovskite Solar Cells by Band Alignment Tuning

ACS Applied Materials & Interfaces
Yoshitaka SanehiraTsutomu Miyasaka

Abstract

An Nb-doped TiO2 (Nb-TiO2) film comprising a double structure stacked with a bottom compact layer and top mesoporous layers was synthesized by treating a Ti precursor-coated substrate using a one-step low-temperature steam-annealing (SA) method. The SA-based Nb-TiO2 films possess high crystallinity and conductivity, and that allows better control over the conduction band (CB) of TiO2 for the electron transport layer (ETL) of the perovskite solar cells by the Nb doping level. Optimization of power conversion efficiency (PCE) for the Nb-TiO2-based ETL was combined with the CB level tuning of the mixed-halide perovskite by changing the Br/I ratio. This band offset management enabled to establish the most suitable energy levels between the ETL and the perovskites. This method was applied to reduce the band gap of perovskites to enhance the photocurrent density while maintaining a high open-circuit voltage. As a result, the optimal combination of 5 mol % Nb-TiO2 ETL and 10 mol % Br in the mixed-halide perovskite exhibited high photovoltaic performance for low-temperature device fabrication, achieving a high-yield PCE of 21.3%.

References

Dec 11, 2013·Journal of the American Chemical Society·Xujie LüYusheng Zhao
May 15, 2014·The Journal of Physical Chemistry Letters·Belen SuarezIvan Mora-Sero
Mar 20, 2014·The Journal of Physical Chemistry Letters·Stefaan De WolfChristophe Ballif
Jan 9, 2016·Science·David P McMeekinHenry J Snaith
Aug 2, 2016·Energy & Environmental Science·Michael SalibaMichael Grätzel
Mar 16, 2017·ACS Applied Materials & Interfaces·Guannan YinShengzhong Frank Liu
Mar 2, 2019·Chemical Reviews·Ajay Kumar JenaTsutomu Miyasaka

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Citations

Feb 18, 2021·Chemical Communications : Chem Comm·Yuiga NakamuraKunihisa Sugimoto
Jun 30, 2021·ACS Applied Materials & Interfaces·Jiming WangRui Zhu
Jul 7, 2020·ACS Applied Materials & Interfaces·Ajay Kumar JenaTsutomu Miyasaka
Oct 22, 2020·ACS Applied Materials & Interfaces·Naoyuki ShibayamaSeigo Ito

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