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Issue 22, 2016
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Film-through large perovskite grains formation via a combination of sequential thermal and solvent treatment

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Abstract

Organic–inorganic halide perovskites have recently attracted strong research interest for fabrication of high-performance, low-cost photovoltaic devices. Recently, we reported a highly reproducible procedure to fabricate high-performance organic–inorganic halide perovskite solar cells. This procedure, based on a one-step, solvent-induced, fast deposition-crystallization method, involves the use of sec-butyl alcohol as a new solvent to induce the CH3NH3PbI3 fast crystallization deposition. In the present study, we propose a reproducible fabrication method to prepare both flat and large-grain perovskite film by adding a pre-annealing step to strengthen the perovskite nucleation, aiming to facilitate the excess CH3NH3I and solvent removal in the sec-butyl alcohol soaking process, in which all films with thickness between 420 nm and 1 μm performed uniformly. The best performing planar device obtained with this procedure had an efficiency of 17.2% under AM 1.5G illumination and an average power conversion efficiency of 16.2 ± 0.5%. We also analyzed the efficiency of halide perovskite planar solar cells as a function of the perovskite film thickness; the efficiency dropped only slightly to 15.7% when the perovskite film thickness was increased to 1 μm.

Graphical abstract: Film-through large perovskite grains formation via a combination of sequential thermal and solvent treatment

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Publication details

The article was received on 15 apr. 2016, accepted on 10 maí 2016 and first published on 10 maí 2016


Article type: Communication
DOI: 10.1039/C6TA03115C
Citation: J. Mater. Chem. A, 2016,4, 8554-8561
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    Film-through large perovskite grains formation via a combination of sequential thermal and solvent treatment

    F. Zhang, J. Song, L. Zhang, F. Niu, Y. Hao, P. Zeng, H. Niu, J. Huang and J. Lian, J. Mater. Chem. A, 2016, 4, 8554
    DOI: 10.1039/C6TA03115C

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