Proceedings of nanoGe Fall Meeting 2018 (NFM18)
Publication date: 6th July 2018
Perovskite materials have attracted huge attention in solar cell studies, due to the advantages of its high charge mobility, long carrier diffusion lengths and low trap density. Despite their attractive properties, perovskite solar cells (PSCs) suffer from the instability of device performance. Perovskite materials undergo rapid degradation in ambient conditions. This degradation of perovskite is also accompanied by decreasing the device performance of PSCs. Although many studies have been carried out to prevent its degradation, this is remained inevitable issue for commercialization of PSCs.
Generally, the structure of PSCs is composed of transparent conductive oxides (TCO), electron and hole transport layer, perovskite layer, and electrode. The materials used in PSCs and their interfaces are important for efficiency and stability of PSCs. Particularly, the electron and hole transport layers can play an important role because they directly contact with perovskite layer. Some materials such as PEDOT:PSS, Spiro-OMeTAD, and PCBM are generally used as charge transport layers. However, due to their hygroscopic properties, they internally accelerate the perovskite degradation in PSCs. To prevent this internal degradation, the other materials which are stable and non-hygroscopic are required. Here, we suggest transition metal dichalcogenides (TMDs) as inorganic charge transport materials for stable PSCs and will discuss mechanisms of the charge transport in TMDs-based PSCs.
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