Proceedings of nanoGe Fall Meeting19 (NFM19)
DOI: https://doi.org/10.29363/nanoge.nfm.2019.188
Publication date: 18th July 2019
Organic metal halide perovskites (OMHP) have seen a dramatic increase in photovoltaics over the past decade. Intensive research on OMHP materials has demonstrated outstanding optical and electronic properties and has resulted in a record power conversion efficiency (PCE) of more than 24%. Besides, OMHPs have a high fault tolerance, regardless of the various manufacturing techniques from vacuum processing to coating and printing of these layers. These properties make OMHPs highly for photovoltaics, but also for lighting and sensor applications.
The main promises for the use of inkjet printing for perovskite solar cells are low production costs, high throughput and a high degree of design and substrate flexibility. Original publications show the potential of ink-jet printed perovskites for harvesting and lighting [1, 2]. Understanding the formation of OMHPs during the deposition and post-treatment process is essential to obtain high quality perovskite layers. By controlling the ink formulation, as well as the post-processing parameters, we are able to control the film roughness and thickness, thus changing the crystallization dynamics. The optimization of the OMHP absorbent layer by a multi-pass printing approach and a mild vacuum annealing step leads to an increase in grain size, photon absorption, and PCE. Solar cells in n-i-p architecture obtain a PCE of 15% on a sub-cm² cell area size.
A future application of printed OMHP solar cells may be building integrated photovoltaics. The production of colored OMHP solar cells benefits from the additive and substrate independent pressure approach [3]. The independently printed perovskite solar cell and the luminescent dye layer thus give more freedom in the production design. The results show that a high color perception of the OMHP solar cell using light absorbing materials of different colors only leads to a small reduction in efficiency.
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