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Title: Blading Phase–Pure Formamidinium–Alloyed Perovskites for High–Efficiency Solar Cells with Low Photovoltage Deficit and Improved Stability

Abstract

Currently, blade-coated perovskite solar cells (PSCs) with high power conversion efficiencies (PCEs), i.e. greater than 20%, normally employ methylammonium lead tri-iodide with a sub-optimal bandgap. Alloyed perovskites with formamidinium (FA) cation have narrower bandgap and thus enhance device photocurrent. However, FA-alloyed perovskites show low phase stability and high moisture sensitivity. Here, we report that incorporating 0.83 molar percent organic halide salts (OHs) into the perovskite inks enables phase-pure, highly crystalline FA-alloyed perovskites with extraordinary optoelectronic properties. Here, the OH molecules modulate the crystal growth, enhance the phase stability, passivate ionic defects at the surface and/or grain boundaries, and enhance the moisture stability of the perovskite film. We demonstrate a high efficiency of 22.0% under 1 sun illumination for blade-coated PSCs with an open-circuit voltage of 1.18 V, corresponding to a very small voltage deficit of 0.33 V, and significantly improved operational stability with 96% of the initial efficiency retained under one sun illumination for 500 hours.

Authors:
ORCiD logo [1];  [2];  [2];  [2]; ORCiD logo [2]
  1. Univ. of North Carolina, Chapel Hill, NC (United States); Univ. of Queensland, Brisbane, QLD (Australia)
  2. Univ. of North Carolina, Chapel Hill, NC (United States)
Publication Date:
Research Org.:
Univ. of North Carolina, Chapel Hill, NC (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1698277
Grant/Contract Number:  
EE0008749
Resource Type:
Accepted Manuscript
Journal Name:
Advanced Materials
Additional Journal Information:
Journal Volume: 32; Journal Issue: 28; Journal ID: ISSN 0935-9648
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; perovskite solar cells; light harvesting; charge recombination; passivation; charge collection

Citation Formats

Wu, Wu‐Qiang, Rudd, Peter N., Wang, Qi, Yang, Zhibin, and Huang, Jinsong. Blading Phase–Pure Formamidinium–Alloyed Perovskites for High–Efficiency Solar Cells with Low Photovoltage Deficit and Improved Stability. United States: N. p., 2020. Web. https://doi.org/10.1002/adma.202000995.
Wu, Wu‐Qiang, Rudd, Peter N., Wang, Qi, Yang, Zhibin, & Huang, Jinsong. Blading Phase–Pure Formamidinium–Alloyed Perovskites for High–Efficiency Solar Cells with Low Photovoltage Deficit and Improved Stability. United States. https://doi.org/10.1002/adma.202000995
Wu, Wu‐Qiang, Rudd, Peter N., Wang, Qi, Yang, Zhibin, and Huang, Jinsong. Thu . "Blading Phase–Pure Formamidinium–Alloyed Perovskites for High–Efficiency Solar Cells with Low Photovoltage Deficit and Improved Stability". United States. https://doi.org/10.1002/adma.202000995. https://www.osti.gov/servlets/purl/1698277.
@article{osti_1698277,
title = {Blading Phase–Pure Formamidinium–Alloyed Perovskites for High–Efficiency Solar Cells with Low Photovoltage Deficit and Improved Stability},
author = {Wu, Wu‐Qiang and Rudd, Peter N. and Wang, Qi and Yang, Zhibin and Huang, Jinsong},
abstractNote = {Currently, blade-coated perovskite solar cells (PSCs) with high power conversion efficiencies (PCEs), i.e. greater than 20%, normally employ methylammonium lead tri-iodide with a sub-optimal bandgap. Alloyed perovskites with formamidinium (FA) cation have narrower bandgap and thus enhance device photocurrent. However, FA-alloyed perovskites show low phase stability and high moisture sensitivity. Here, we report that incorporating 0.83 molar percent organic halide salts (OHs) into the perovskite inks enables phase-pure, highly crystalline FA-alloyed perovskites with extraordinary optoelectronic properties. Here, the OH molecules modulate the crystal growth, enhance the phase stability, passivate ionic defects at the surface and/or grain boundaries, and enhance the moisture stability of the perovskite film. We demonstrate a high efficiency of 22.0% under 1 sun illumination for blade-coated PSCs with an open-circuit voltage of 1.18 V, corresponding to a very small voltage deficit of 0.33 V, and significantly improved operational stability with 96% of the initial efficiency retained under one sun illumination for 500 hours.},
doi = {10.1002/adma.202000995},
journal = {Advanced Materials},
number = 28,
volume = 32,
place = {United States},
year = {2020},
month = {5}
}

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