1) Perovskite photovoltaic devices 2) Back Contact PSCs
1) A focus on new perovskite precursors, charge transport layers and encapsulations methods to simultaneously improve efficiency and stability of perovskite solar cells. 2) Back-contact perovskite solar cells are fabricated by depositing methylammonium lead iodide perovskite into micron-sized grooves, with opposite walls of each groove being coated with either n- or p-type selective contacts. V-shaped grooves are created by embossing a polymeric substrate, with the different charge-selective electrodes deposited onto the walls of the groove using a directional evaporation technique. We show that individual grooves act as photovoltaic devices, having a power conversion efficiency of up to 7.3 %. By series-connecting multiple grooves, we create integrated micro-modules that build open circuit voltages up to nearly 15 V and power conversion efficiencies over 4 %. The devices created are fully flexible, do not include rare metals, and are processed using techniques applicable to roll-to-roll processing.