Rationally induced interfacial dipole in planar heterojunction perovskite solar cells for reduced JV hysteresis

Zonghao Liu, Qi Chen, Jin Wook Lee, Zhixin Zhao, Xiaobao Xu, Yao Tsung Hsieh, Lei Meng, Pengyu Sun, Nicholas De Marco, Huanping Zhou, Yi Bing Cheng, Yang Yang

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12 Citations (Scopus)

Abstract

With the rapid progress in developing hybrid perovskite solar cells, the allure of current density–voltage (J–V) hysteresis has attracted quite a lot of interest in the research community. It requires feasible approaches that further deepen the fundamental understanding of device physics in specific device architecture in order to solve this problem eventually. Here, perovskite solar cells configured with different counter electrodes are systematically investigated with the focus on charge accumulation within the devices responsible for J–V hysteresis. The results indicate that J–V hysteresis is affected by charge accumulation which can be modulated by carrier extraction efficiency of the electrodes. Through a rationally induced interfacial dipole, the devices have shown improvement in carrier extraction, which thus reduces J–V hysteresis significantly. It provides solid evidence for the proposition that interface charge plays an important role in J–V hysteresis, and demonstrates an applicable strategy that effectively alleviates J–V hysteresis in perovskite solar cells.

Original languageEnglish
Article number1800568
Number of pages11
JournalAdvanced Energy Materials
Volume8
Issue number23
DOIs
Publication statusPublished - 16 Aug 2018

Keywords

  • dipoles
  • hysteresis
  • interfaces
  • perovskites
  • solar cells

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