AEM: Record efficiency! Defects of high efficiency trans perovskites battery and synchronous modulation of buried interface

• The suppression of non radiative recombination in perovskite solar cells (PSCs) is essential to improve their power conversion efficiency and operational stability. Qinye Bao of East China Normal University and Jianming Yang of Shanghai University reported that the PTAA: F4TCNQ/DA/perovskite: DA hole selective heterostructures were judiciously constructed using molecular diazolanes (DA) as intermediate layers and additives simultaneously.
  

• The heterojunction reduces the thermal ion loss of collecting holes at the buried interface between perovskite and PTAA: F4TCNQ, and reduces the defect location at such buried interface and in the perovskite film. The "one stone, three birds" strategy proposed by the authors significantly promotes charge transport, while inhibiting interface carrier recombination and defect assisted recombination.

  
  

  As a result, compared with 19.04% of the control device, a significant increase in efficiency of 22.15% and an impressive fill factor of 83.92% are achieved, and the device has excellent stability. These two values are the highest records of polycrystalline MAPbI3-based p-i-n PSC reported so far. This work provides a very promising way to further improve the performance of PSC by using a functional material.

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• Xu, Y., Xiong, S., Jiang, S., Yang, J., Li, D., Wu, H., You, X., Zhang, Y., Ma, Z., Xu, J., Tang, J., Yao, Y., Sun, Z., Bao, Q., Synchronous Modulation of Defects and Buried Interfaces for Highly Efficient Inverted Perovskite Solar Cells. Adv. Energy Mater. 2022, 2203505.

  DOI: 10.1002/aenm.202203505
  

  https://doi.org/10.1002/aenm.202203505