Efficient hole-conductor-free, fully printable mesoscopic perovskite solar cells with a broad light harvester NH2CHNH2PbI3

Formamidinium lead trihalide perovskite (FAPbI3) was successfully introduced into hole-conductor-free, fully printable mesoscopic perovskite solar cells with a carbon counter electrode. With the sequential deposition method, a FAPbI3 based solar cell yielded an efficiency of 11.9%, superior to the methylammonium lead trihalide perovskite (MAPbI3) solar cell efficiency of 11.4%, which is due to broadening of the light to 840 nm. By optimizing the mixing ratio of the formamidimium and methylammonium cations to 3 : 2, a power conversion efficiency of 12.9% was achieved with this low-cost, fully printable mesoscopic solar cell, which indicated a promising prospect for low-cost photovoltaic technology.

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