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Highly stable perovskite solar cells with a novel Ni-based metal organic complex as dopant-free hole-transporting material

DOI: 10.1016/j.jechem.2021.06.005 DOI Help

Authors: Tai Wu (Yunnan University) , Linqin Wang (Westlake University; Westlake Institute for Advanced Study) , Rongjun Zhao (Yunnan University) , Rongshan Zhuang (Yunnan University) , Kanghong Zhao (Yunnan University) , Gaoyuan Liu (Yunnan University) , Jing Huang (KTH-Royal Institute of Technology) , Licheng Sun (Westlake University; Westlake Institute for Advanced Study) , Yong Hua (Yunnan University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Energy Chemistry , VOL 65 , PAGES 312 - 318

State: Published (Approved)
Published: July 2021
Diamond Proposal Number(s): 20805

Abstract: Hole-transporting material (HTM) plays a paramount role in enhancing the photovltaic performance of perovskite solar cells (PSCs). Currently, the vast majority of these HTMs employed in PSCs are organic small molecules and polymers, yet the use of organic metal complexes in PSCs applications remains less explored. To date, most of reported HTMs require additional chemical additives (e.g. Li-TFSI, t-TBP) towards high performance, however, the introduction of additives decrease the PSCs device stability. Herein, an organic metal complex (Ni-TPA) is first developed as a dopant-free HTM applied in PSCs for its facile synthesis and efficient hole extract/transfer ability. Consequently, the dopant-free Ni-TPA-based device achieves a champion efficiency of 17.89%, which is superior to that of pristine Spiro-OMeTAD (14.25%). Furthermore, we introduce a double HTM layer with a graded energy bandgap containing a Ni-TPA layer and a CuSCN layer into PSCs, the non-encapsulated PSCs based on the Ni-TPA/CuSCN layers affords impressive efficiency up to 20.39% and maintains 96% of the initial PCE after 1000 h at a relative humidity around 40%. The results have demonstrated that metal organic complexes represent a great promise for designing new dopant-free HTMs towards highly stable PSCs.

Journal Keywords: Perovskite solar cell; Hole transporting material; Organic metal complex; Dopant-free

Diamond Keywords: Photovoltaics; Semiconductors

Subject Areas: Chemistry, Energy, Materials

Instruments: I19-Small Molecule Single Crystal Diffraction

Discipline Tags:

Earth Sciences & Environment Sustainable Energy Systems Energy Molecular Complexes Climate Change Energy Materials Chemistry Material Sciences Metal-Organic Frameworks Perovskites Metallurgy Organometallic Chemistry

Technical Tags:

Diffraction High Pressure Single Crystal Diffraction