Journal
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
Volume 34, Issue 9, Pages 1474-1480Publisher
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2018.03.005
Keywords
Solar cells; Perovskite; Hole transfer material
Funding
- Major Basic Research Program, Ministry of Science and Technology of China [2014CB239401]
- National Natural Science Foundation of China [51402306, 51422210, 51629201, 51521091]
- Key Research Program of Frontier Sciences CAS [QYZDB-SSW-JSC039]
- Newton Advanced Fellowship
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The efficiency of perovskite solar cells (PSCs) has increased from around 4% to over 22% following a few years of intensive investigation. For most PSCs, organic materials such as 2,2',7,7'-tetrakis(N,N-pdimethoxyphenylamino)-9,9'-spirobifluorene (spiro-OMeTAD) are used as the hole transporting materials (HTMs), which are thermally and chemically unstable and also expensive. Here, we explored nickel phthalocyanine (NiPc) as a stable and cost-effective HTM to replace the conventionally used spiro-OMeTAD. Because of its high carrier mobility and proper band alignments, we achieved a PCE of 12.1% on NiPc based planar device with short-circuit current density (J(sc) ) of 17.64 mAcm(-2), open circuit voltage (V-oc) of 0.94V, and fill factor (FF) of 73%, outperforming the planar device based on copper phthalocyanine (CuPc) that is an outstanding representative of metal phthalocyanines (MPcs) reported. Moreover, the device with NiPc shows much improved stability compared to that based on the conventional spiro-OMeTAD as a result of NiPc's high stability. Photoluminescence (PL) and Impedance spectroscopy analysis results show that thermally deposited NiPc has good hole-extraction ability. Our results suggest that NiPc is a promising HTM for the large area, low cost and stable PSCs. (C) 2018 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
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