Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
Publication date: 21st February 2018
High quality perovskite absorbers based on a simple CH3NH3PbI3 structure can be obtained using wet or dry processes. Vacuum evaporation has been demonstrated as an efficient method to fabricate uniform and pin-hole-free perovskite films with complete surface coverage. One advantage is that this technique does not require volatile solvents such DMF or DMSO. Furthermore, by employing co-evaporation vacuum deposition of PbI2 and CH3NH3I in different stacks, high quality CH3NH3PbI3 films can be prepared on different types of substrates with different surface wettabilities, potentially leading to better interfacial contacts.
The data of our experiments shows that co-evaporated CH3NH3PbI3 layers cover the substrates with a well crystalized tetragonal phase of CH3NH3PbI3. The crystallinity and morphology of the perovskite layer was studied by XRD and high resolution TEM analysis. Moreover the passivation of the TiO2 layer by PCBM plays and important role for high-performance perovskite solar cells. The EDX mapping for the carbon distribution confirmed that a passivation of layer for the TiO2 is successfully generated. Devices composed of evaporated CH3NH3PbI3 and a double layer of TiO2/PCBM as an electron transport layer are able to achieve high stabilized PCEs of over 16%. Moreover, as an advantage of the evaporation method, perovskite layers have been successfully deposited on top of textured Si-solar cells with homogeneous and full surface coverage, which is a relevant technique for the preparation of silicon-perovskite tandem devices and for applications on textured substrates.
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