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Issue 42, 2016
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Ambient air-processed mixed-ion perovskites for high-efficiency solar cells

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Mixed-ion (FAPbI3)1−x(MAPbBr3)x perovskite solar cells have achieved power conversion efficiencies surpassing 20%. However, in order to obtain these high efficiencies the preparation is performed in a controlled inert atmosphere. Here, we report a procedure for manufacturing highly efficient solar cells with a mixed-ion perovskite in ambient atmosphere. By including a heating step at moderate temperatures of the mesoporous titanium dioxide substrates, and spin-coating the perovskite solution on the warm substrates in ambient air, a red intermediate phase is obtained. Annealing the red phase at 100 °C results in a uniform and crystalline perovskite film, whose thickness is dependent on the substrate temperature prior to spin-coating. The temperature was optimized between 20 and 100 °C and it was observed that 50 °C substrate temperature yielded the best solar cell performances. The average efficiency of the best device was 17.6%, accounting for current–voltage (IV) measurement hysteresis, with 18.8% performance in the backward scan direction and 16.4% in the forward scan direction. Our results show that it is possible to manufacture high-efficiency mixed-ion perovskite solar cells under ambient conditions, which is relevant for large-scale and low-cost device manufacturing processing.

Graphical abstract: Ambient air-processed mixed-ion perovskites for high-efficiency solar cells

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The article was received on 12 Aug 2016, accepted on 20 Sep 2016 and first published on 23 Sep 2016

Article type: Paper
DOI: 10.1039/C6TA06912F
Citation: J. Mater. Chem. A, 2016,4, 16536-16545
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    Ambient air-processed mixed-ion perovskites for high-efficiency solar cells

    K. Sveinbjörnsson, K. Aitola, J. Zhang, M. B. Johansson, X. Zhang, J. Correa-Baena, A. Hagfeldt, G. Boschloo and E. M. J. Johansson, J. Mater. Chem. A, 2016, 4, 16536
    DOI: 10.1039/C6TA06912F

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