Potassium Incorporation for Enhanced Performance and Stability of Fully Inorganic Cesium Lead Halide Perovskite Solar Cells

Jae Keun Nam, Sung Uk Chai, Wonhee Cha, Yung Ji Choi, Wanjung Kim, Myung Sun Jung, Jeong Kwon, Dongho Kim, Jong Hyeok Park

Research output: Contribution to journalArticlepeer-review

397 Citations (Scopus)


Thermally unstable nature of hybrid organic-inorganic perovskites has been a major obstacle to fabricating the long-term operational device. A cesium lead halide perovskite has been suggested as an alternative light absorber, due to its superb thermal stability. However, the phase instability and poor performance are hindering the further progress. Here, cesium lead halide perovskite solar cells with enhanced performance and stability are demonstrated via incorporating potassium cations. Based on Cs0.925K0.075PbI2Br, the planar-architecture device achieves a power conversion efficiency of 10.0%, which is a remarkable record in the field of inorganic perovskite solar cells. In addition, the device shows an extended operational lifetime against air. Our research will stimulate the development of cesium lead halide perovskite materials for next-generation photovoltaics.

Original languageEnglish
Pages (from-to)2028-2033
Number of pages6
JournalNano letters
Issue number3
Publication statusPublished - 2017 Mar 8

Bibliographical note

Funding Information:
J.H.P. acknowledges the support from National Research Foundation of Korea (NRF) grant funded by the Korea government (NRF-2013R1A2A1A09014038, 2015M1A2A2074663, 2014M3A7B4052200). D.K. acknowledges the support from the National Research Foundation of Korea (NRF) grants funded by the Ministry of Science, ICT Future Planning (MSIP) of Korea under contracts NRF-2012M3A6A7054861 (Global Frontier R and D Program on Center for Multiscale Energy System).

Publisher Copyright:
© 2017 American Chemical Society.

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering


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