Diindenoperylene (DIP) concentration dependent photovoltaic performance and dielectric properties for mixed heterojunctions

Yan Qiong Zheng, Chao Wang, Jun Le Yu, Fang Yang, Bin Wei, Yang Lin, Xi Feng Li, Chihaya Adachi

研究成果: ジャーナルへの寄稿記事

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To find some intrinsic relevance between the photovoltaic performance and dielectric properties of diindenoperylene (DIP) mixed heterojunctions (MHJs), this work demonstrates both the photovoltaic performance and dielectric characteristic dependence on the DIP concentration. 5 wt%-DIP MHJ shows relatively higher performance compared to other MHJs with higher DIP ratio over the range of 5 wt%–90 wt%. The dielectric constant of blend layers decreases with the DIP ratio, thus results in larger Coulomb capture radius and exciton binding energy, which suppresses the exciton dissociation in MHJs with high DIP ratio. Then, the dielectric characteristic of capacitance-voltage (C-V) in dark and under illumination as well as of capacitance-frequency (C-f) at dc bias of 1.6 V for the DIP MHJs were measured. The geometric capacitance of the MHJs extracted from the C-V in dark indicates a positive dependence on the DIP concentration. C-V peak height decreases with the DIP concentration from 0 to 60 wt% implies that the hole drift becomes dominated at higher DIP content. The open circuit voltage (VOC) of all the MHJs shows an identical trend with the normalized built-in potential. In dark condition, depletion width (W) gradually decreases with the DIP concentration from 5 wt% to 60 wt%. W becomes narrower under illumination, ascribed to the increased capacitance from photo-generated charge. The free carrier density (ND) imposes a negative influence on fill factor of MHJs. The extracted electron mobility by C-f characteristic gradually decreases with the DIP ratio.

元の言語英語
ページ(範囲)35-40
ページ数6
ジャーナルSynthetic Metals
233
DOI
出版物ステータス出版済み - 11 1 2017

    フィンガープリント

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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