TY - JOUR
T1 - Regulating Surface Heterogeneity Maximizes Photovoltage and Operational Stability in Tin-Lead Perovskite Solar Cells
AU - Gunasekaran, Rajendra Kumar
AU - Jung, Jina
AU - Yang, Sung Woong
AU - Im, Doyun
AU - Choi, Won Chang
AU - Yun, Yeonghun
AU - Lee, Sangwook
N1 - Publisher Copyright:
© 2023 American Chemical Society.
PY - 2024/1/12
Y1 - 2024/1/12
N2 - We present a surface reconstruction strategy for tin-lead perovskites, effectively addressing the issue of oxidized Sn fragments on surfaces and interfaces. Our surface treatment involving postfabrication iodide supplementation effectively regulates undesired surface binding states and reconstructs the compositional gradient. Through surface-sensitive and depth-resolved analysis, we unveil a strong correlation among surface compositional disorder, photovoltage, and operational stability in tin-lead perovskites. Surface-reconstructed perovskite films demonstrate improved carrier lifetime, reduced defect density, and higher recombination resistance compared with untreated films. As a result, devices utilizing surface-reconstructed perovskites exhibit remarkable performance with high power conversion efficiency (up to 23%) and open-circuit voltage (0.88 V), alongside enhanced operational stability compared to untreated counterparts. These insights into the surface vulnerabilities of mixed tin-lead perovskites, coupled with the underlying chemistry of surface passivation, pave the way for significant advancements in narrow-band gap perovskite solar cells.
AB - We present a surface reconstruction strategy for tin-lead perovskites, effectively addressing the issue of oxidized Sn fragments on surfaces and interfaces. Our surface treatment involving postfabrication iodide supplementation effectively regulates undesired surface binding states and reconstructs the compositional gradient. Through surface-sensitive and depth-resolved analysis, we unveil a strong correlation among surface compositional disorder, photovoltage, and operational stability in tin-lead perovskites. Surface-reconstructed perovskite films demonstrate improved carrier lifetime, reduced defect density, and higher recombination resistance compared with untreated films. As a result, devices utilizing surface-reconstructed perovskites exhibit remarkable performance with high power conversion efficiency (up to 23%) and open-circuit voltage (0.88 V), alongside enhanced operational stability compared to untreated counterparts. These insights into the surface vulnerabilities of mixed tin-lead perovskites, coupled with the underlying chemistry of surface passivation, pave the way for significant advancements in narrow-band gap perovskite solar cells.
UR - http://www.scopus.com/inward/record.url?scp=85181004440&partnerID=8YFLogxK
U2 - 10.1021/acsenergylett.3c02402
DO - 10.1021/acsenergylett.3c02402
M3 - Article
AN - SCOPUS:85181004440
SN - 2380-8195
VL - 9
SP - 102
EP - 109
JO - ACS Energy Letters
JF - ACS Energy Letters
IS - 1
ER -
