Details

Autor(en) / Beteiligte

• Chang, Chih-Yu
• Zuo, Lijian
• Yip, Hin-Lap
• Li, Yongxi
• Li, Chang-Zhi
• Hsu, Chain-Shu
• Cheng, Yen-Ju
• Chen, Hongzheng
• Jen, Alex K.-Y.

Titel

A Versatile Fluoro-Containing Low-Bandgap Polymer for Efficient Semitransparent and Tandem Polymer Solar Cells

Ist Teil von

• Advanced functional materials, 2013-10, Vol.23 (40), p.5084-5090

Ort / Verlag

Blackwell Publishing Ltd

Erscheinungsjahr

2013

Quelle

Wiley Online Library Journals Frontfile Complete

Beschreibungen/Notizen

• The versatility of a fluoro‐containing low band‐gap polymer, poly[2,6‐(4,4‐bis(2‐ethylhexyl)‐4H‐cyclopenta[2,1‐b;3,4‐b’]dithiophene)‐alt‐4,7‐(5‐fluoro‐2,1,3‐benzothia‐diazole)] (PCPDTFBT) in organic photovoltaics (OPVs) applications is demonstrated. High boiling point 1,3,5‐trichlorobenzene (TCB) is used as a solvent to manipulate PCPDTFBT:[6,6]‐phenyl‐C71‐butyric acid methyl ester (PC71BM) active layer morphology to obtain high‐performance single‐junction devices. It promotes the crystallization of PCPDTFBT polymer, thus improving the charge‐transport properties of the active layer. By combining the morphological manipulation with interfacial optimization and device engineering, the single‐junction device exhibits both good air stability and high power‐conversion efficiency (PCE, of 6.6%). This represents one of the highest PCE values for cyclopenta[2,1‐b;3,4‐b’]dithiophene (CPDT)‐based OPVs. This polymer is also utilized for constructing semitransparent solar cells and double‐junction tandem solar cells to demonstrate high PCEs of 5.0% and 8.2%, respectively. The versatility of a fluoro‐containing polymer, PCPDTFBT, in diverse organic photovoltaic applications is demonstrated. By combining morphological, interface, and device engineering, the single‐junction cell shows both a high power conversion efficiency (PCE) of 6.6% and good air stability. In addition, the applications of PCPDTFBT in highly efficient semitransparent cells (PCE = 5.0%, average visible transmittance (AVT) = 47.3%) and double‐junction tandem cells (PCE = 8.2%) are also demonstrated.