@article{JiangTaoStolterfohtetal.2020,
  author    = {Jiang, Wei and Tao, Chen and Stolterfoht, Martin and Jin, Hui and Stephen, Meera and Lin, Qianqian and Nagiri, Ravi C. R. and Burn, Paul L. and Gentle, Ian R.},
  title     = {Hole-transporting materials for low donor content organic solar cells},
  series = {Organic electronics : physics, materials and applications},
  volume    = {76},
  journal   = {Organic electronics : physics, materials and applications},
  publisher = {Elsevier},
  address   = {Amsterdam},
  issn      = {1566-1199},
  doi       = {10.1016/j.orgel.2019.105480},
  pages     = {7},
  year      = {2020},
  abstract  = {Low donor content solar cells are an intriguing class of photovoltaic device about which there is still considerable discussion with respect to their mode of operation. We have synthesized a series of triphenylamine-based materials for use in low donor content devices with the electron accepting [6,6]-phenyl-C71-butyric acid methyl ester (PC(7)0BM). The triphenylamine-based materials absorb light in the near UV enabling the PC(7)0BM to be be the main light absorbing organic semiconducting material in the solar cell. It was found that the devices did not operate as classical Schottky junctions but rather photocurrent was generated by hole transfer from the photo-excited PC(7)0BM to the triphenylamine-based donors. We found that replacing the methoxy surface groups with methyl groups on the donor material led to a decrease in hole mobility for the neat films, which was due to the methyl substituted materials having the propensity to aggregate. The thermodynamic drive to aggregate was advantageous for the performance of the low donor content (6 wt\%) films. It was found that the 6 wt\% donor devices generally gave higher performance than devices containing 50 wt\% of the donor.},
  language  = {en}
}
@misc{ShoaeeStolterfohtNeher2018,
  author    = {Shoaee, Safa and Stolterfoht, Martin and Neher, Dieter},
  title     = {The Role of Mobility on Charge Generation, Recombination, and Extraction in Polymer-Based Solar Cells},
  series = {dvanced energy materials},
  volume    = {8},
  journal   = {dvanced energy materials},
  number    = {28},
  publisher = {Wiley-VCH},
  address   = {Weinheim},
  issn      = {1614-6832},
  doi       = {10.1002/aenm.201703355},
  pages     = {20},
  year      = {2018},
  abstract  = {Organic semiconductors are of great interest for a broad range of optoelectronic applications due to their solution processability, chemical tunability, highly scalable fabrication, and mechanical flexibility. In contrast to traditional inorganic semiconductors, organic semiconductors are intrinsically disordered systems and therefore exhibit much lower charge carrier mobilities-the Achilles heel of organic photovoltaic cells. In this progress review, the authors discuss recent important developments on the impact of charge carrier mobility on the charge transfer state dissociation, and the interplay of free charge extraction and recombination. By comparing the mobilities on different timescales obtained by different techniques, the authors highlight the dispersive nature of these materials and how this reflects on the key processes defining the efficiency of organic photovoltaics.},
  language  = {en}
}