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:
-
[1];
[2]
- Univ. of North Carolina, Chapel Hill, NC (United States); Univ. of Queensland, Brisbane, QLD (Australia)
- Univ. of North Carolina, Chapel Hill, NC (United States)
- Publication Date:
- Research Org.:
- University of North Carolina, Chapel Hill, NC (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office
- OSTI Identifier:
- 1698277
- Alternate Identifier(s):
- OSTI ID: 1894664; OSTI ID: 1894786
- 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. doi: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 = {Thu May 28 00:00:00 EDT 2020},
month = {Thu May 28 00:00:00 EDT 2020}
}
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