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Letian Dou, Wei-Hsuan Chang, Jing Gao, Chun-Chao Chen, Jingbi You and Yang Yang A Selenium-Substituted Low-Bandgap Polymer with Versatile Photovoltaic Applications Advanced Materials 25

Version of Record online: 2 NOV 2012 | DOI: 10.1002/adma.201203827

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A reduction of the bandgap and an enhancement of the charge transport properties of a LBG polymer (PBDTT-DPP) can be achieved simultaneously by changing the sulfur atoms on the DPP unit to selenium atoms. The newly designed polymer, PBDTT-SeDPP (Eg = 1.38 eV), shows excellent photovoltaic performance in single junction devices with power conversion efficiencies (PCEs) over 7% and photo-response up to 900 nm. A tandem polymer solar cell and a visibly transparent solar cell based on PBDTT-SeDPP show 9.5% and 4.5% PCEs, which are superior to those based on PBDTT-DPP.

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