Effect of hole-transporting materials on the photovoltaic performance and stability of all-ambient-processed perovskite solar cells

Nanaji Islavath; S Saroja; K Srinivas Reddy; P C Harikesh; G Veerappan; Shrikant V Joshi; Easwaramoorthi Ramasamy

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Effect of hole-transporting materials on the photovoltaic performance and stability of all-ambient-processed perovskite solar cells

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High-efficiency perovskite solar cells (PSCs) reported hitherto have been mostly prepared in a moisture and oxygen-free glove-box atmosphere,which hampers upscaling and real-time performance assessment of this exciting photovoltaic technology.In this work,we have systematically studied the feasibility of allambient-processing of PSCs and evaluated their photovoltaic performance.It has been shown that phasepure crystalline tetragonal MAPbI3 perovskite films are instantly formed in ambient air at room temperature by a two-step spin coating process,undermining the need for dry atmosphere and post-annealing.All-ambient-processed PSCs with a configuration of FTO/TiO2/MAPbI3/Spiro-OMeTAD/Au achieve opencircuit voltage (990 mV) and short-circuit current density (20.31 mA/cm2) comparable to those of best reported glove-box processed devices.Nevertheless,device power conversion efficiency is still constrained at 5％ by the unusually low fill-factor of 0.25.Dark current-voltage characteristics reveal poor conductivity of hole-transporting layer caused by lack of oxidized spiro-OMeTAD species,resulting in high seriesresistance and decreased fill-factor,The study also establishes that the above limitations can be readily overcome by employing an inorganic p-type semiconductor,copper thiocyanate,as ambient-processable hole-transporting layer to yield a fill-factor of 0.54 and a power conversion efficiency of 7.19％.The present findings can have important implications in industrially viable fabrication of large-area PSCs.

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《天然气化学（英文版）》 |2017年第3期|584-591|共8页
作者
Nanaji Islavath; S Saroja; K Srinivas Reddy; P C Harikesh; G Veerappan; Shrikant V Joshi; Easwaramoorthi Ramasamy;
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Centre for Solar Energy Materials, International Advanced Research Centre for Powder Metallurgy and New Materials(ARCI), Hyderabad 500005, India;

Centre for Solar Energy Materials, International Advanced Research Centre for Powder Metallurgy and New Materials(ARCI), Hyderabad 500005, India;

Centre for Solar Energy Materials, International Advanced Research Centre for Powder Metallurgy and New Materials(ARCI), Hyderabad 500005, India;

Centre for Solar Energy Materials, International Advanced Research Centre for Powder Metallurgy and New Materials(ARCI), Hyderabad 500005, India;

Centre for Solar Energy Materials, International Advanced Research Centre for Powder Metallurgy and New Materials(ARCI), Hyderabad 500005, India;

Centre for Solar Energy Materials, International Advanced Research Centre for Powder Metallurgy and New Materials(ARCI), Hyderabad 500005, India;

Centre for Solar Energy Materials, International Advanced Research Centre for Powder Metallurgy and New Materials(ARCI), Hyderabad 500005, India;

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Effect of hole-transporting materials on the photovoltaic performance and stability of all-ambient-processed perovskite solar cells

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