Polyethylenimine ethoxylated interlayer-mediated ZnO interfacial engineering for high-performance and low-temperature processed flexible perovskite solar cells: A simple and viable route for one-step processed CH3NH3PbI3

Ju Won Lim, Huan Wang, Chi Hun Choi, Li Na Quan, Kyungwha Chung, Won Tae Park, Yong Young Noh, Dong Ha Kim

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

Developing perovskite solar cells (PSCs) with high-efficiency and a low-temperature process has great potential for the realization of the scalable, economic, and roll-to-roll based renewable energy conversion devices. ZnO has been recognized as the promising electron transport layer (ETL) that may overcome the limitations of the conventional TiO2. However, methylammonium lead iodide (MAPbI3) perovskite is prone to decomposition at the ZnO surface, which hinders the development of simple one-step deposition of perovskite, resulting in the limited photovoltaic performance. Herein, we report interlayer mediated efficient ETLs for viable flexible PSCs. The utilization of polyethyleneimine ethoxylated layer on ZnO prevents the direct contact between the perovskite and ETLs, avoiding the photoactive layer decomposition. Thus, interlayer-mediated PSCs show higher efficiency with enhanced stability by decreasing the electron transport barrier. As a result, the PSC employing tailor-designed ETL interfaces exhibited average power conversion efficiency (PCE) of 15.8%, which was superior by 25.4% to that of a control device (12.6%). With our strategy, we further demonstrated PSCs on flexible substrates which exhibit an average PCE of 11.9% under low-temperature fabrication. The new interface engineering strategy may pave the way to the realization of high performance, easy-to-process, and large-area perovskite optoelectronics.

Original languageEnglish
Article number226956
JournalJournal of Power Sources
Volume438
DOIs
StatePublished - 31 Oct 2019

Keywords

  • Flexible perovskite solar cell
  • High-efficiency
  • Low-temperature process
  • Next generation energy source
  • PEIE interlayer
  • ZnO buffer layer

Fingerprint

Dive into the research topics of 'Polyethylenimine ethoxylated interlayer-mediated ZnO interfacial engineering for high-performance and low-temperature processed flexible perovskite solar cells: A simple and viable route for one-step processed CH3NH3PbI3'. Together they form a unique fingerprint.

Cite this