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Efficient and stable planar hole-transport-layer-free perovskite solar cells were fabricated using low temperature processed tin dioxide (SnO2, 180 °C) as electron-transport-material and carbon film (100 °C) as top electrode. Open circuit voltage of 1.03 ± 0.02 (highest at 1.07) V was obtained, which was 100 mV higher than that of reference devices using conventional high-temperature-processed mesoporous...
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