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Effects of gas blowing condition on formation of mixed halide perovskite layer on organic scaffolds

  • Takeshi Gotanda (a1), Shigehiko Mori (a1), Haruhi Oooka (a1), Hyangmi Jung (a1), Hideyuki Nakao (a1), Kenji Todori (a1) and Yutaka Nakai (a1)...

Perovskite solar cells are promising for realizing high power conversion efficiency (PCE) with low manufacturing costs, but efficient coating methods are needed for commercialization. Here, a gas blowing method was used to fabricate perovskite solar cells and was found to create a smooth perovskite layer and to prevent voids in large-area cells, when organic materials were used as scaffolds for forming the perovskite. A PCE of 13% in a 1 cm2 active area is achieved by tuning the band-gap energy of MAPbX3 via substitution of Br for I ions in X sites. Incorporation of a poly(3,4-ethylenedioxythiophene) hole transport layer with a higher work function increased the open circuit voltage of the solar cells. All layers of the cells were fabricated at low temperatures (<140 °C), which makes it possible to incorporate a polymer substrate for producing flexible solar cells and high-throughput fabrication.

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Journal of Materials Research
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