Journal
ACS ENERGY LETTERS
Volume 5, Issue 5, Pages 1396-1403Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.0c00596
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Funding
- National Research Foundation (NRF) - Korean Government (MSIP) [2016R1A5A1012966, 2017M2A2A6A01020854, 2019R1A2C2087218]
- Basic Science Research Fund of Ulsan National Institute of Science AMP
- Technology (UNIST) [1.190119.01]
- National Research Foundation of Korea [2019R1A2C2087218, 2017M2A2A6A01020854, 22A20130012860] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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While perovskite solar cells (PSCs) have emerged as promising low-cost solar power generators, most reported high-performance PSCs employ electron transport layers (ETLs, mainly TiO2) treated at high temperatures (>= 450 degrees C), which may eventually hinder the development of flexible PSCs. Meanwhile, the development of low- temperature processed PSCs (L-PSCs) possessing performance levels comparable to those of high-temperature processed PSCs has actively been reported. In this study, L-PSCs with improved long-term stability and negligible hysteresis were developed through the effective passivation of shallow and deep traps in organic-inorganic hybrid perovskite (OIHP) crystals and at the ETL/OIHP interface. L-PSCs with alkaline chloride modification achieved state-of-the-art performance among reported L-PSCs (power conversion efficiency (PCE) = 22.6%) with a long-term shelf life. The origin of long-term stability and the efficient passivation of deep traps was revealed by monitoring the trap-state distribution. Moreover, the high PCE of a large-area device (21.3%, 1.12 cm(2)) was also demonstrated, confirming the uniformity of the modification.
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