@article{4823db9034e646b1bad7dc6c3aa6d2b3,
title = "Improved Absorber Phase Stability, Performance, and Lifetime in Inorganic Perovskite Solar Cells with Alkyltrimethoxysilane Strain-Release Layers at the Perovskite/TiO2Interface",
abstract = "All-inorganic β-CsPbI3 has superior chemical and thermal stability compared to its hybrid counterparts, but the stability of state-of-the-art β-CsPbI3 perovskite solar cells (PSCs) under normal operating conditions (i.e., under illumination in an inert atmosphere) remains inferior to their hybrid counterparts. Here, we found that the lattice distortion in CsPbI3 near the perovskite/electron transport layer (ETL) interface can induce polymorphic transformation in encapsulated CsPbI3 films aged under illumination. To suppress this lattice distortion, we introduced alkyltrimethoxysilane strain-release layers (SRLs) at the perovskite/ETL interface. We found the SRL with the longest alkyl chain is the most effective at reducing interfacial lattice distortion, leading to enhanced charge transfer at the perovskite/ETL interface and improved phase/device stability. Its incorporation in β-CsPbI3 solar cells resulted in a power-conversion efficiency of 20.1% and an operational lifetime with an extrapolated T80 of >3000 h for encapsulated devices tested under continuous illumination under maximum power point tracking conditions.",
author = "Tianran Liu and Xiaoming Zhao and Xinjue Zhong and Burlingame, {Quinn C.} and Antoine Kahn and Loo, {Yueh Lin}",
note = "Funding Information: The authors thank Dr. E. Tsai and Dr. R. Li for their help with X-ray scattering measurements, which were conducted at the Center for Functional Nanomaterials (CFN) and the Complex Materials Scattering (CMS) beamline of the National Synchrotron Light Source II (NSLS-II), which both are U.S. DOE Office of Science Facilities, at Brookhaven National Laboratory under Contract No. DE-SC0012704. The authors acknowledge the use of Princeton{\textquoteright}s Imaging and Analysis Center, which is partially supported by the Princeton Center for Complex Materials, a National Science Foundation (NSF)-MRSEC program (DMR-1420541). T.L. thanks the Maeder Graduate Fellowship in Energy and the Environment for funding and expresses gratitude to Dr. Yu Xia for helpful discussions about silanes. Y.-L.L. acknowledges support from the National Science Foundation, under grants DMR-1627453, CMMI-1824674, and STTR-1843743. A.K. acknowledges support from the United States–Israel Binational Science Foundation (Grant No. 2018349). Funding Information: The authors thank Dr. E. Tsai and Dr. R. Li for their help with X-ray scattering measurements, which were conducted at the Center for Functional Nanomaterials (CFN) and the Complex Materials Scattering (CMS) beamline of the National Synchrotron Light Source II (NSLS-II) which both are U.S. DOE Office of Science Facilities, at Brookhaven National Laboratory under Contract No. DE-SC0012704. The authors acknowledge the use of Princeton{\textquoteright}s Imaging and Analysis Center, which is partially supported by the Princeton Center for Complex Materials a National Science Foundation (NSF)-MRSEC program (DMR-1420541). T.L. thanks the Maeder Graduate Fellowship in Energy and the Environment for funding and expresses gratitude to Dr. Yu Xia for helpful discussions about silanes. Y.-L.L. acknowledges support from the National Science Foundation, under grants DMR-1627453, CMMI-1824674, and STTR-1843743. A.K. acknowledges support from the United States–Israel Binational Science Foundation (Grant No. 2018349). Publisher Copyright: {\textcopyright} 2022 American Chemical Society.",
year = "2022",
month = oct,
day = "14",
doi = "10.1021/acsenergylett.2c01610",
language = "English (US)",
volume = "7",
pages = "3531--3538",
journal = "ACS Energy Letters",
issn = "2380-8195",
publisher = "American Chemical Society",
number = "10",
}