Interchain hydrogen-bonded conjugated polymer for enhancing the stability of organic solar cells

다국어 초록 (Multilingual Abstract)

Operational stability of organic solar cells (OSCs) is a key issue for the commercialization. In order toenhance the stability of OSCs, various strategies are being used. In this study, pyrroles and isoindigomonomers with tert-butoxycarbonyl side chains were synthesized and used to prepare a D–A-type polymer,P(TBPyTBIID), via Stille coupling. The obtained polymer dissolved readily in organic solvents, such aschloroform. However, the formation of interchain hydrogen bonds after side-chain cleavage via thermaltreatment rendered the resulting polymer insoluble in organic solvents. In addition, strong p p stackingdue to face-on orientation enabled dense packing of the structure, which led to an increase in resistancesto organic solvents, acid, and ultraviolet (UV) light. P(TBPyTBIID) was introduced as a UV and externalprotective layer, along with silver nanoparticles, at the back surface of the glass substrate. The lightsoakingstability was enhanced without significantly reducing the efficiencies of the organic solar cells.
This work indicates that introducing an UV blocking layer can be an effective strategy to increase the stabilityof organic solar cells.

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