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Two major drawbacks in dye-sensitized solar cells (DSSC) are the narrow spectral response and the short-term stability. Research on development of artificial dyes for a broad frequency response is a major field of research today. The work presented here shows a broad response with a natural dye extracted from a Mondo-grass (Ophiopogon japonicus) berry. Its range of sensitivity covers the entire visible...
The wavelength limit (λc) of detection in a conventional photodetector is limited to a characteristic energy (Δ) through the relationship: λc = hc/Δ, where Δ also determines the detector noise (dark current) and hence its performance such as the operating temperature. Here, we report an infrared photodetector with an extended operating range (responding beyond the standard spectral threshold) based...
We report photovoltaic infrared detectors based on graded-barrier asymmetric heterostructures. Detectors with a single period structure showed room temperature operation with a zero-response threshold of ∼4 µm, and a comparable detectivity to 30-period photoconductive split-off detectors reported previously. An additional long-wavelength response peak of up to 8 µm was also observed when the operating...
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