4.7 Article

Determining the Role of the Molecular Weight of Poly(Ethylene Glycol) Additives in Perovskite Photodetectors

期刊

ACS APPLIED ENERGY MATERIALS
卷 5, 期 10, 页码 12158-12164

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acsaem.2c01673

关键词

lead halide perovskites; polymeric additives; photodetectors; molecular weight; steric effect

资金

  1. National Natural Science Foundation of China
  2. Hunan Provincial Science and Technology Department
  3. Postdoctoral Science Foundation of China
  4. [62004066]
  5. [2022GK2038]
  6. [2021M690952]

向作者/读者索取更多资源

The molecular weight of polymeric additives significantly impacts the performance of perovskite photodetectors. By tuning the molecular weight, parameters such as crystal size and noise current can be optimized to improve the photodetection performance.
The performance of perovskite photodetectors was often tuned by changing the functional groups of polymeric additives, rather than their molecular weight to improve defect passivation. As a result of the steric effect of polymeric additives, we found that the molecular weight of poly(ethylene glycol) (PEG) additives played an important role in determining the perovskite crystal size, which increased from 470 to 550 nm with increasing molecular weight from 6k to 10k but declined back to 450 nm with further increasing molecular weight to 20k. The noise current, rather than the external quantum efficiency, was the dominant factor that can be tailored to improve the photodetection performance using PEG additives with different molecular weights. The photodetectors based on the 10k PEG additive exhibited a high specific detectivity of 1.9 x 1011 Jones, a linear dynamic range of 119 dB, and a frequency response -3 dB of 11.57 kHz. This work demonstrates an alternative approach by tailoring the molecular weight of polymeric additives to optimize the morphology of perovskite films for improved performance in perovskite photodetectors and other perovskite optoelectronic devices.

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