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Optimizing the Buried Interface in Flexible Perovskite Solar Cells to Achieve Over 24% Efficiency and Long-Term Stability. | LitMetric

Optimizing the Buried Interface in Flexible Perovskite Solar Cells to Achieve Over 24% Efficiency and Long-Term Stability.

Adv Mater

Key Laboratory for Physical Electronics and Devices (MoE) & Shaanxi Key Lab of Information Photonic Technique, School of Electronic Science and Engineering, Xi'an Jiaotong University, Xi'an, 710049, China.

Published: February 2024

AI Article Synopsis

  • - The buried interface of the perovskite layer crucially impacts film morphology, defect formation, and aging resistance, affecting the quality and performance of perovskite solar cells, especially with FAPbI that tends to degrade from this interface early on.
  • - Introducing proline hydrochloride (PF), which has a structured design, serves as a medium at the buried interface, creating a stable α-phase FAPbI template and preventing degradation from phase transitions.
  • - This approach leads to a remarkable solar cell efficiency of 24.61% (with a certified 23.51%), setting a record for flexible perovskite solar cells, while also demonstrating excellent stability in both shelf-life and mechanical tests. *

Article Abstract

The buried interface of the perovskite layer has a profound influence on its film morphology, defect formation, and aging resistance from the outset, therefore, significantly affects the film quality and device performance of derived perovskite solar cells. Especially for FAPbI , although it has excellent optoelectronic properties, the spontaneous transition from the black perovskite phase to nonperovskite phase tends to start from the buried interface at the early stage of film formation then further propagate to degrade the whole perovskite. In this work, by introducing ─NH rich proline hydrochloride (PF) with a conjugated rigid structure as a versatile medium for buried interface, it not only provides a solid α-phase FAPbI template, but also prevents the phase transition induced degradation. PF also acts as an effective interfacial stress reliever to enhance both efficiency and stability of flexible solar cells. Consequently, a champion efficiency of 24.61% (certified 23.51%) can be achieved, which is the highest efficiency among all reported values for flexible perovskite solar cells. Besides, devices demonstrate excellent shelf-life/light soaking stability (advanced level of ISOS stability protocols) and mechanical stability.

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Source
http://dx.doi.org/10.1002/adma.202308039DOI Listing

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