Synergistic Effects of Lead Thiocyanate Additive and Solvent Annealing on the Performance of Wide-Bandgap Perovskite Solar Cells

Kai Zhu, Yue Yu, Changlei Wang, Corey Grice, Niraj Shrestha, Dewei Zhao, Weiqiang Liao, Lei Guan, Rasha Awni, Weiwei Meng, Alexander Cimaroli, Randy Ellingson, Yanfa Yan

Research output: Contribution to journalArticlepeer-review

190 Scopus Citations

Abstract

We show that the cooperation of lead thiocyanate additive and a solvent annealing process can effectively increase the grain size of mixed-cation lead mixed-halide perovskite thin films while avoiding excess lead iodide formation. As a result, the average grain size of the wide-bandgap mixed-cation lead perovskite thin films increases from 66 ± 24 to 1036 ± 111 nm, and the mean carrier lifetime shows a more than 3-fold increase, from 330 ns to over 1000 ns. Consequently, the average open-circuit voltage of wide-bandgap perovskite solar cells increases by 80 (70) mV, and the average power conversion efficiency (PCE) increases from 13.44 ± 0.48 (11.75 ± 0.34) to 17.68 ± 0.36 (15.58 ± 0.55)% when measured under reverse (forward) voltage scans. The best-performing wide-bandgap perovskite solar cell, with a bandgap of 1.75 eV, achieves a stabilized PCE of 17.18%.

Original languageAmerican English
Pages (from-to)1177-1182
Number of pages6
JournalACS Energy Letters
Volume2
Issue number5
DOIs
StatePublished - 12 May 2017

Bibliographical note

Publisher Copyright:
© 2017 American Chemical Society.

NREL Publication Number

  • NREL/JA-5900-68289

Keywords

  • annealing
  • lead thiocyanate additive
  • perovskite solar cells
  • thin films

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