Organic Semiconductor Based Devices for Solar Water Splitting

Liang Yao, Aiman Rahmanudin, Nestor Guijarro, Kevin Sivula

    Research output: Contribution to journalReview articlepeer-review

    Abstract

    Solution processable organic semiconductors are well‐established as high‐performance materials for inexpensive and scalable solar energy conversion in organic photovoltaic (OPV) devices, but their promise in the economic conversion of solar energy into chemical energy (solar fuels) has only recently been recognized. Herein, the main approaches employing organic semiconductor‐based devices toward solar H2 generation via water splitting are compared and performance demonstrations are reviewed. OPV‐biased water electrolysis is seen to advance significantly with the development of the tandem OPV device and the optimization of operating potential and redox catalysts. This approach now exceeds 6% solar‐to‐hydrogen conversion efficiency while over 10% is reasonably feasible. By contrast, while the direct water splitting by an organic semiconductor in a photo‐electrochemical cell has attractive advantages, increasing the performance remains a challenge. Photocathodes employing a bulk‐heterojunction have been optimized to give 7–8 mA cm−2 water reduction photocurrent under standard conditions, but photoanodes remain <1 mA cm−2, and robustness remains a critical issue. However, recent investigations into the direct organic semiconductor/electrolyte interface have brought important insights into free charge generation, the nature of the semiconductor/catalyst interface, and the stability of organic photoelectrodes. Outlooks toward advancing both approaches are discussed.
    Original languageEnglish
    JournalAdvanced Energy Materials
    Volume8
    Issue number32
    Early online date4 Oct 2018
    DOIs
    Publication statusPublished - 15 Nov 2018

    Keywords

    • conjugated polymers
    • hydrogen evolution reaction
    • photo-electrochemistry
    • solar fuels
    • tandem cells

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