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Boosting Stability of Cesium/Formamidinium Based Perovskite Solar Cells via Eliminating Intermediate Phase Transition and X-Anion Vacancy. | LitMetric

AI Article Synopsis

  • Researchers are focusing on improving the stability of cesium/formamidinium (Cs/FA) perovskite solar cells (PSCs) due to their complex crystallization processes that often lead to efficiency loss.
  • Incorporating iodine monobromide (IBr) into the precursor solution helps regulate crystallization by promoting the formation of perovskite crystal nuclei and reducing impurities.
  • The resulting solar cells achieve an efficiency of 24.82% and maintain 89% of that efficiency after 400 hours of continuous operation, showcasing a successful method for enhancing both performance and stability.

Article Abstract

Boosting the stability of cesium/formamidinium (Cs/FA) based perovskite solar cells (PSCs) has received tremendous attention. However, the crystallization of perovskites usually undergoes complex intermediate phase transitions and ion loss processes, which seriously degrade the efficiency and stability of PSCs. Herein, iodine monobromide (IBr, an interhalogen) is incorporated into the precursor solution to regulate the perovskite crystallization process. IBr can directly induce the formation of perovskite crystal nuclei in the intermediate film, avoiding a complex phase transformation (2H-4H-3C). This leads to a reduction in the impurity phase, an increase in grain size, and an improvement in crystal quality. Furthermore, IBr can effectively compensate X-anion vacancy, thereby reducing defect density and nonradiative recombination, which enhances device performance. Thus, the efficiency of the optimal device is 24.82%. Simultaneously, the device demonstrated excellent stability. After 400 h of continuous operation, the efficiency value of the unencapsulated PSCs still retains 89% of its initial value. This study provides an effective strategy for manufacturing PSCs with excellent efficiency and stability.

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Source
http://dx.doi.org/10.1021/acsami.4c16316DOI Listing

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