Publication date: 31st May 2020
It is well known that perovskite solar cells (PSC) exhibit high efficiencies up to 25%[https://www.nrel.gov/pv/assets/pdfs/best-research-cell-efficiencies.20190923.pdf], but at the same time, they have low operational stability owing to degradation of complex lead iodides (e.g. CH3NH3PbI3) used as absorber materials [1]. Photoactive material degrades during operation under the influence of moisture and oxygen, as well as visible and UV light and heat. [2]. One of the possible ways to mitigate such degradation is using polymeric charge-transport materials that form high-quality and dense films, thereby suppressing the diffusion of aggressive environmental species inside the active layer of the device and evaporation of volatile aging products outside thus giving them time to react and reform the perovskite absorber material.
In this work we present the synthesis of conjugated polymer based on pyrrolo[3,4-c]pyrrole-1,4-dione and its study as electron-transport material for perovskite solar cells. Polymer P1 was assembled using benzo[c][1,2,5]oxadiazole block with triethylene glycol monoethyl ether side chains to improve the interface contact between the ETL and the perovskite. The devices showed decent efficiency of 12.1% while using pure polymer ETL and 14.1% for a hybrid ETL based on a mixture of P1 with PCBM. Preliminary data on the device stability will be presented.
This work was funded by the Russian Science Foundation (grant No. 19-73-30020).
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