A Selenium-Substituted Low-Bandgap Polymer with Versatile Photovoltaic Applications

作者：Dou, Letian; Chang, Wei-Hsuan; Gao, Jing; Chen, Chun-Chao; You, Jingbi; Yang, Yang^*

来源：Advanced Materials, 2013, 25(6): 825-831.

DOI：10.1002/adma.201203827

• selenium
• low-bandgap polymer
• tandem solar cell
• visibly-transparent solar cell

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.

• 出版日期2013-2-13