CaltechAUTHORS
Published December 28, 2017 | Version Supplemental Material
Journal Article Open

Fermi level alignment by copper doping for efficient ITO/perovskite junction solar cells

Creators

  • 1. ROR icon Xuchang University
  • 2. ROR icon East China Normal University
  • 3. ROR icon China Academy of Engineering Physics
  • 4. ROR icon Joint Center for Artificial Photosynthesis
  • 5. ROR icon California Institute of Technology
  • 6. ROR icon Division of Chemistry
  • 7. ROR icon University of Electronic Science and Technology of China

Abstract

Different from band edge alignment, the Fermi level mismatch induced by band bending can manipulate charge collection at the ITO/(CH_3NH_3)_(1−x)Cu_xPbI_3 heterojunctions. In this work, we employed a feasible spin-coating process to prepare copper defect compensation in CH_3NH_3PbI_3. The related work function was shown to shift with the copper doping density by Kelvin probe force microscopy (KPFM). Next, we applied transient surface photovoltage (TSPV) spectroscopy and first-order series reactions simulations to confirm that interface charge recombination at the ITO/perovskite junction can be eliminated through Cu+ doping. Nanoelectric photoconductive AFM analysis showed enhanced charge transfer and a higher photovoltage at the ITO/Cu-perovskite junction. Owing to efficient Fermi level alignment, the ITO/(CH_3NH_3)_(1−x)Cu_xPbI_3/PCBM/Ag devices displayed high power conversion efficiencies of 15.14 ± 0.67% at ambient conditions for inverted perovskite solar cells without any hole transport layer.

Additional Information

© 2017 The Royal Society of Chemistry. Received 6th September 2017, Accepted 27th October 2017, First published on 27th October 2017. The authors thank Prof. Dunwei Wang and Dr Pinjiang Li for helpful discussion, Prof. Shiyou Chen for DFT prediction, Prof. Dejun Wang for TSPV analysis, Ms. Songzi Liu for sample preparation, and Prof. Hongsheng Wang and Dr Zhensheng Li for transient PL measurements. This work was supported by the National Natural Science Foundation of China (Grant No. 21673200, 61504117, U1604121 and 21273192), the Innovation Scientists and Technicians Troop Construction Projects of Henan Province (Grant No. 144200510014). There are no conflicts to declare.

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Additional details

Identifiers

Eprint ID
83064
Resolver ID
CaltechAUTHORS:20171108-100927260

Funding

National Natural Science Foundation of China
21673200
National Natural Science Foundation of China
61504117
National Natural Science Foundation of China
U1604121
National Natural Science Foundation of China
21273192
Henan Province Technicians Troop Construction Projects
144200510014

Dates

Created
2017-11-08
Created from EPrint's datestamp field
Updated
2021-11-15
Created from EPrint's last_modified field