Sunlight-activated graphene-heterostructure transparent cathodes: Enabling high-performance n-graphene/p-Si Schottky junction photovoltaics

Po Hsun Ho, Wei Chen Lee, Yi Ting Liou, Ya Ping Chiu, Yi Siang Shih, Chun Chi Chen, Pao Yun Su, Min Ken Li, Hsuen Li Chen, Chi Te Liang, Chun Wei Chen

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

Compared to widely-reported graphene-based anodes, the task of obtaining a stable graphene-based cathode is generally more difficult to achieve because n-type graphene devices have very limited thermal and chemical stabilities, and are usually sensitive to the influence of the ambient environment. This work developed a novel "sunlight-activated" graphene-heterostructure transparent electrode in which photogenerated charges from a light-absorbing material are transferred to graphene, resulting in the modulation of electrical properties of the graphene transparent electrode caused by a strong light-matter interaction at graphene-heterostructure interfaces. A photoactive graphene/TiOx-heterostructure transparent cathode was used to fabricate an n-graphene/p-Si Schottky junction solar cell, achieving a record-high power conversion efficiency (>10%). The photoactive graphene-heterostructure transparent electrode, which exhibits excellent tunable electrical properties under sunlight illumination, has great potential for use in the future development of graphene-based photovoltaics and optoelectronics.

Original languageEnglish
Pages (from-to)2085-2092
Number of pages8
JournalEnergy and Environmental Science
Volume8
Issue number7
DOIs
Publication statusPublished - 2015 Jul 1

ASJC Scopus subject areas

  • Environmental Chemistry
  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Pollution

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  • Cite this

    Ho, P. H., Lee, W. C., Liou, Y. T., Chiu, Y. P., Shih, Y. S., Chen, C. C., Su, P. Y., Li, M. K., Chen, H. L., Liang, C. T., & Chen, C. W. (2015). Sunlight-activated graphene-heterostructure transparent cathodes: Enabling high-performance n-graphene/p-Si Schottky junction photovoltaics. Energy and Environmental Science, 8(7), 2085-2092. https://doi.org/10.1039/c5ee00548e