Journal
JOURNAL OF POWER SOURCES
Volume 319, Issue -, Pages 1-8Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2016.04.032
Keywords
Organolead halide perovskite; Molybdenum disulfide; Tungsten disulfide; Graphene oxide; Hole extraction layer
Funding
- National Research Foundation of Korea (NRF) - Korean government (MSIP) [2014R1A2A1A11051098]
- International Cooperative R&D program through Korea Institute for Advancement of Technology - Ministry of Trade, Industry and Energy (MOTIE) of Korea
- National Research Foundation of Korea - Ministry of Education
- National Research Foundation of Korea [2014R1A2A1A11051098] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Atomically thin two-dimensional materials such as MoS2, WS2, and graphene oxide (GO) are used as hole extraction layers (HEL) in organolead halide perovskites solar cells (PSCs) instead of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) HEL. MoS2 and WS2 layers with a polycrystalline structure were synthesized by a chemical deposition method using a uniformly spin-coated (NH4)MoS4 and (NH4)WS4 precursor solution. GO was synthesized by the oxidation of natural graphite powder using Hummers' method. The work functions of MoS2, WS2, and GO are measured to be 5.0, 4.95, and 5.1 eV, respectively. The X-ray diffraction spectrum indicated that the synthesized perovskite material is CH3NH3PbI1-xClx. The PSCs with the p-n junction structure were fabricated based on the CH3NH3PbI3-xClx perovskite layer. The power conversion efficiencies of the MoS2, WS2, and GO-based PSCs were 9.53%, 8.02%, and 9.62%, respectively, which are comparable to those obtained from PEDOT:PSS-based devices (9.93%). These results suggest that two-dimensional materials such as MoS2, WS2, and GO can be promising candidates for the formation of HELs in the PSCs. (C) 2016 Elsevier B.V. All rights reserved.
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