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OPV Polymer Acceptors

Having achieved 10% power conversion efficiencies (PCE), all-polymer solar cells (all-PSCs) have been the subject of significant research interest in recent years. With p-type polymers as electron donors and n-type polymers as electron acceptors, all-PSCs have contributed to the rise of high thermal, mechanical and photochemical device stability - with the prospect of large-area production. Unlike conventional polymer-fullerene solar cells, all-polymer OPVs have the potential to develop into a wider range of polymer materials; with the alteration of their chemical structures to adjust energy levels and film morphology for better device stability and efficiency. Unlike fullerenes, polymer acceptors cover a wider spectrum of visible light and have much higher absorption coefficients.

High-performing polymer donor materials have been intensively studied and well-developed. However, high-performing polymer acceptor materials are yet to be fully explored. Among them, polymer acceptors incorporated with imide-based repeating units (such as naphthalenediimide (NDI) and perylenediimide) are currently the most promising n-type polymer candidates. This is due to their great electron-transporting capabilities and higher electron affinities.

In addition to PNDI2(OD)2T and PNF222, we now stock PNDI(2HD)T and PNDI(2HD)2T, copolymers of naphtalene and bithiophene. PNDI(2HD)2T shows a higher degree of crystalline behaviours (that can promote 3D charge transport) compared to PNDI2(OD)2T. PNDI(2HD)T exhibited a PCE of 6.64% with better flexibility, stretching, and bending properties when compared to polymer solar cells with PCBMs as acceptors.

Related categories: semiconducting polymersOFET & OLED polymers, OPV polymer donors, interface polymers

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