Non-preheating fabricated semitransparent Quasi-2D perovskite solar cells

Although the hot-casting (HC) method can obtain efficient quasi-2D perovskite solar cells, this method cannot effectively control the uniformity of the thin film, and the high preheating substrate temperature will also form low n perovskite phases (n = 2) at the interface, which is not conducive to the transport of carriers. Semitransparent solar cells have great application prospects in building-integrating photovoltaic and tandem device. Herein, a non-preheating (NP) film-casting method is proposed to realize highly uniform and phase controllable quasi-2D perovskite film (BA2MA3Pb4I13, BA+: C4H11NH3+, MA+: CH3NH3+). As a result, the NP-processed gets the highest light utilization efficiency (LUE =4.01%) for semitransparent quasi-2D perovskite solar cells (ST-Quasi-2D-PSCs) with power conversion efficiency (PCE) of 9.60%, average visible transmittance (AVT) of 41.73%, shows good bifaciality factor and stability.

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