Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
Hybrid halide perovskite materials have exploded onto the optoelectronic materials scene in the past five years. Due to the wide variety of possibilities for all three ions in the perovskite structure, hundreds of distinct compositions have already been reported. Such compositional changes can alter the diffusion length – a key parameter for solar cell performance – by several orders of magnitude. Furthermore, optimization of material processing conditions has led to diffusion length increases of at least a factor of ten. Given the large compositional and processing parameter space, a rapid and simple technique for directly measuring diffusion length is needed. Here we use such a method – called the steady-state photocarrier grating (SSPG) technique – to screen the diffusion length in hybrid halide perovskite materials. First, we control the processing conditions and the resulting grain size to increase the diffusion length in pure methyl ammonium lead iodide from 216 nm to 490 nm. Next, we partially replace iodide with bromide and show that surprisingly, the diffusion length increases after aging 1 month in air. Finally, we use a 4 nm aluminum oxide layer to passivate the surface of methyl ammonium lead bromide, leading to an increase in diffusion length from 201 nm to 532 nm.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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