Nonconjugated Polymer Poly(vinylpyrrolidone) as an Efficient Interlayer Promoting Electron Transport for Perovskite Solar Cells

Pengcheng Zhou, Zhimin Fang, Weiran Zhou, Qiquan Qiao, Mingtai Wang, Tao Chen, Shangfeng Yang

Research output: Contribution to journalArticlepeer-review

43 Scopus citations

Abstract

The interfaces between perovskite layer and electrodes play a crucial role on efficient charge transport and extraction in perovskite solar cells (PSCs). Herein, for the first time we applied a low-cost nonconjugated polymer poly(vinylpyrrolidone) (PVP) as a new interlayer between PCBM electron transport layer (ETL) and Ag cathode for high-performance inverted planar heterojunction perovskite solar cells (iPSCs), leading to a dramatic efficiency enhancement. The CH3NH3PbI3-xClx-based iPSC device incorporating the PVP interlayer exhibited a power conversion efficiency (PCE) of 12.55%, which is enhanced by ∼15.9% relative to that of the control device without PVP interlayer (10.83%). The mechanistic investigations based on morphological, optical, and impedance spectroscopic characterizations reveal that incorporation of PVP interlayer promotes electron transport across the CH3NH3PbI3-xClx perovskite/Ag interface via PCBM ETL. Besides, PVP incorporation induces the formation of a dipole layer, which may enhance the built-in potential across the device, conjunctly promoting electron transport from PCBM to Ag cathode and consequently leading to significantly improved fill factor (FF) from 58.98 to 66.13%.

Original languageEnglish (US)
Pages (from-to)32957-32964
Number of pages8
JournalACS Applied Materials and Interfaces
Volume9
Issue number38
DOIs
StatePublished - Sep 27 2017
Externally publishedYes

Keywords

  • dipole layer
  • electron transport layer
  • interface engineering
  • perovskite solar cells
  • poly(vinylpyrrolidone)

ASJC Scopus subject areas

  • Materials Science(all)

Fingerprint Dive into the research topics of 'Nonconjugated Polymer Poly(vinylpyrrolidone) as an Efficient Interlayer Promoting Electron Transport for Perovskite Solar Cells'. Together they form a unique fingerprint.

Cite this