Extending the Photovoltaic Response of Perovskite Solar Cells into the Near-Infrared with a Narrow-Bandgap Organic Semiconductor

Xiaoming Zhao, Chao Yao, Tianran Liu, J. Clay Hamill, Guy Olivier Ngongang Ndjawa, Guangming Cheng, Nan Yao, Hong Meng, Yueh Lin Loo*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

72 Scopus citations

Abstract

Typical lead-based perovskites solar cells show an onset of photogeneration around 800 nm, leaving plenty of spectral loss in the near-infrared (NIR). Extending light absorption beyond 800 nm into the NIR should increase photocurrent generation and further improve photovoltaic efficiency of perovskite solar cells (PSCs). Here, a simple and facile approach is reported to incorporate a NIR-chromophore that is also a Lewis-base into perovskite absorbers to broaden their photoresponse and increase their photovoltaic efficiency. Compared with pristine PSCs without such an organic chromophore, these solar cells generate photocurrent in the NIR beyond the band edge of the perovskite active layer alone. Given the Lewis-basic nature of the organic semiconductor, its addition to the photoactive layer also effectively passivates perovskite defects. These films thus exhibit significantly reduced trap densities, enhanced hole and electron mobilities, and suppressed illumination-induced ion migration. As a consequence, perovskite solar cells with organic chromophore exhibit an enhanced efficiency of 21.6%, and substantively improved operational stability under continuous one-sun illumination. The results demonstrate the potential generalizability of directly incorporating a multifunctional organic semiconductor that both extends light absorption and passivates surface traps in perovskite active layers to yield highly efficient and stable NIR-harvesting PSCs.

Original languageEnglish
Article number1904494
JournalAdvanced Materials
Volume31
Issue number49
DOIs
StatePublished - 1 Dec 2019
Externally publishedYes

Bibliographical note

Funding Information:
The authors acknowledge the use of Princeton's Imaging and Analysis Center, which is partially supported by the Princeton Center for Complex Materials, a National Science Foundation (NSF)-MRSEC program (DMR-1420541). Y.-L.L. acknowledges support from the National Science Foundation, under grants DMR-1420541, CMMI-1824674, STTR-1843743, and the U.S. Department of Energy's Office of Energy Efficiency and Renewable Energy (EERE) under Solar Energy Technologies Office (SETO) Agreement Number DE-EE0008560. J.C.H. was supported by the Department of Defense (DoD) through a National Defense Science and Engineering Graduate (NDSEG) Fellowship. H.M. acknowledges the Shenzhen Hong Kong Innovation Circle joint R & D project (SGLH20161212101631809), the China (Shenzhen) – Canada Technology Collaboration Project (GJHZ20180420180725249), the Shenzhen Science and Technology research grant (JCYJ20170818090312652) and the Guangdong International Science Collaboration Base (2019A050505003). C.Y. thanks the support from China Scholarship Council (CSC File No. 201806010248).

Publisher Copyright:
© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Keywords

  • NIR light harvesting
  • narrow-bandgap organic semiconductors
  • passivation
  • perovskite solar cells

ASJC Scopus subject areas

  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering

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