Low Band Gap Polymer Solar Cells With Minimal Voltage Losses.

Chuanfei Wang, Xiaofeng Xu, Wei Zhang, Jonas Bergqvist, Yuxin Xia, Xiangyi Meng, Kim Bini, Wei Ma, Arkady Yartsev, Koen Vandewal, Mats R. Andersson, Olle Inganas, Mats Fahlman, Ergang Wang

Research output: Contribution to journalArticlepeer-review

85 Citations (Scopus)


One of the factors limiting the performance of organic solar cells (OSCs) is their large energy losses (E loss) in the conversion from photons to electrons, typically believed to be around 0.6 eV and often higher than those of inorganic solar cells. In this work, a novel low band gap polymer PIDTT-TID with a optical gap of 1.49 eV is synthesized and used as the donor combined with PC71BM in solar cells. These solar cells attain a good power conversion efficiency of 6.7% with a high open-circuit voltage of 1.0 V, leading to the E loss as low as 0.49 eV. A systematic study indicates that the driving force in this donor and acceptor system is sufficient for charge generation with the low E loss. This work pushes the minimal E loss of OSCs down to 0.49 eV, approaching the values of some inorganic and hybrid solar cells. It indicates the potential for further enhancement of the performance of OSCs by improving their V oc since the E loss can be minimized.

Original languageEnglish
Article number1600148
Number of pages10
JournalAdvanced Energy Materials
Issue number18
Publication statusPublished - 21 Sept 2016
Externally publishedYes


  • conjugated polymers
  • low band gaps
  • low energy losses
  • organic photovoltaics


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