Kilian Lohmann

Cohort 4



Perovskite heterojunctions by vapour deposition

Metal halide perovskite materials have emerged over the past few years as a particularly promising PV technology, with power conversation efficiencies now exceeding 22%. Vapour deposition was the technique we used to develop the first efficient planar heterojunction perovskite solar cell, though to date the vast majority of perovskite materials and devices studied worldwide have been based on solution processed methyl ammonium lead triiodide. However, vapour deposition has a number of clear advantages over solution processing in terms of (i) control and flexibility of device architecture, (ii) compatibility and uniformity for large area industrial production, and (iii) ability to build up multilayers without concern over solvent compatibility.

While tandem solar cells based on silicon and perovskite have recently been demonstrated, the possibility to construct multilayer all perovskite solar cells is particularly exciting, and vapour deposition is an ideal technique to achieve this. In this project you will create solar cells based on multilayer perovskite materials using vapour deposition. The project will develop methods for multilayers perovskite structures and investigate perovskite-perovskite interfaces using optical spectroscopy. In optimising deposition parameters, a combinatorial approach will be used, allowing large parameters spaces to be explored. The multilayers structures will be implemented in all-perovskite tandem solar cells.