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Surface Passivation of Perovskite Solar Cells with Oxalic Acid: Increased Efficiency and Device Stability. | LitMetric

Surface Passivation of Perovskite Solar Cells with Oxalic Acid: Increased Efficiency and Device Stability.

Chempluschem

School of Physics and Optoelectronic Engineering, Yangtze University, Jingzhou, 434023, China.

Published: October 2023

Solution processed perovskite films usually exhibit numerous defect states on the surfaces of the films. Here in this work, oxalic acid (H C O ), which has two C=O groups, is selected and used to passivate the surface defects of the two-step deposited perovskite films via post-treatment. Strong interaction between H C O molecule and the Pb ions located on the surface of perovskite film has been confirmed via Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy, which can result in an effective suppress of the surface defects. Furthermore, time-resolved PL spectrum indicates that carrier lifetime is prolonged in the H C O passivated perovskite film. After optimizing the H C O concentration, the target perovskite solar cells can demonstrate superior power conversion efficiencies (21.67 % from reverse measurement and 21.54 % from forward measurement) and superior device-stability.

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Source
http://dx.doi.org/10.1002/cplu.202300367DOI Listing

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