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J Phys Chem Lett. 2017 Apr 20;8(8):1824-1830. doi: 10.1021/acs.jpclett.7b00515. Epub 2017 Apr 10.

Performance Characterization of Dye-Sensitized Photovoltaics under Indoor Lighting.

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National Nano Device Laboratories, Institute of Electro-Optical Engineering, National Chiao Tung University , Hsinchu 30078, Taiwan, R.O.C.
Department of Applied Chemistry, National Chi Nan University , Nantou 54561, Taiwan, R.O.C.
Department of Chemical Engineering, National Taiwan University of Science and Technology , Taipei 106, Taiwan, R.O.C.
Green Energy and Environment Research Laboratories, Industrial Technology Research Institute , Hsinchu 31040, Taiwan, R.O.C.
Institute of Chemistry, Academia Sinica , Taipei 115, Taiwan, R.O.C.
Department of Chemical Engineering and Institute of Polymer Science and Engineering, National Taiwan University , Taipei 10617, Taiwan, R.O.C.
Department of Electrical Engineering, National Kaohsiung University of Applied Sciences , Kaohsiung 807, Taiwan, R.O.C.
Institute of Nuclear Energy Research, Atomic Energy Council , Taoyuan 32546, Taiwan, R.O.C.


Indoor utilization of emerging photovoltaics is promising; however, efficiency characterization under room lighting is challenging. We report the first round-robin interlaboratory study of performance measurement for dye-sensitized photovoltaics (cells and mini-modules) and one silicon solar cell under a fluorescent dim light. Among 15 research groups, the relative deviation in power conversion efficiency (PCE) of the samples reaches an unprecedented 152%. On the basis of the comprehensive results, the gap between photometry and radiometry measurements and the response of devices to the dim illumination are identified as critical obstacles to the correct PCE. Therefore, we use an illuminometer as a prime standard with a spectroradiometer to quantify the intensity of indoor lighting and adopt the reverse-biased current-voltage (I-V) characteristics as an indicator to qualify the I-V sampling time for dye-sensitized photovoltaics. The recommendations can brighten the prospects of emerging photovoltaics for indoor applications.

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