Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 4, Issue 15, Pages 2455-2460Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jz4012299
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Funding
- Japan Science and Technology Agency (JST) thorough its Funding Program for Core Research for Evolutional Science and Technology (CREST)
- New Energy and Industrial Technology Development Organization (NEDO)
- Ministry of Economy, Trade and Industry (METI), Japan
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The improvement of solar cell performance in the near-infrared (near-IR) region is an important challenge to increase power conversion efficiency under one-sun illumination. PbS quantum-dot (QD)-based heterojunction solar cells with high efficiency in the near-IR region were constructed by combining ZnO nanowire arrays with PbS QDs, which give a first exciton absorption band centering at wavelengths longer than 1 pm. The morphology of ZnO nanowire arrays was systematically investigated to achieve high light-harvesting efficiency as well as efficient carrier collection. The solar cells with the PbS QD/ZnO nanowire structures made up of densely grown thin ZnO nanowires about 1.2 mu m long yielded a maximum incident-photon-to-current conversion efficiency (IPCE) of 58% in the near-IR region (@1020 nm) and over 80% in the visible region (shorter than 670 nm). The power conversion efficiency obtained on the solar cell reached about 6.0% under simulated one-sun illumination.
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