Journal
ACS ENERGY LETTERS
Volume 7, Issue 10, Pages 3353-3361Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.2c01578
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Funding
- U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Solar Energy Technologies Office [DE-EE0008749, DE-EE0008978]
- Department of Chemistry at the Colorado School of Mines for providing Teaching Assistantships
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In this study, researchers successfully used a easily synthesized polymer HTM CzAn to replace PEDOT:PSS as the hole transport material in Sn-Pb PSCs. Through optimization of doping and surface engineering, high quality Sn-Pb PSCs with higher conversion efficiency and stability were fabricated.
As the most commonly used hole transport material (HTM) in tin-lead (Sn-Pb) perovskite solar cells (PSCs), poly(3,4-ethylenedioxythiophene) polystyrenesulfonate (PEDOT:PSS) limits the power conversion efficiency (PCE) and stability of the PSCs due to its acidic characteristics. Herein, an easily synthesized polymer HTM poly[(phenyl)imino[9-(2-ethylhexyl)carbazole]-2,7-diyl] (CzAn) with a shallow highest occupied molecular orbital (HOMO) level of -4.95 eV is used in a p-i-n structure, methylammonium-free, Sn-Pb PSC to replace PEDOT:PSS. Upon optimization using doping and surface engineering, high quality Sn-Pb PSCs could be successfully fabricated, boosting the PCE to 22.6% (stabilized PCE of 21.3%) compared with 21.2% for PEDOT:PSS. The perovskite films prepared on the modified CzAn HTM possess improved crystallinity, reduced trap-state density, and larger carrier mobility resulting in PSCs with greatly improved stability.
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