Intrinsic Trade-off between Up-Conversion and Trapping Rates in InAs Quantum Dots for Intermediate-Band Solar Cells
| Autor: | David M. Tex, Kouichi Akahane, Yoshihiko Kanemitsu |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Photocurrent Physics Condensed matter physics Infrared General Physics and Astronomy 02 engineering and technology Trapping 021001 nanoscience & nanotechnology 01 natural sciences Imaging phantom Intermediate band Quantum dot Quantum mechanics 0103 physical sciences Up conversion 0210 nano-technology |
| Zdroj: | Physical Review Applied. 6 |
| ISSN: | 2331-7019 |
| DOI: | 10.1103/physrevapplied.6.044003 |
| Popis: | More is always better, right? No, not always. The authors show that in intermediate-band solar cells based on quantum dots, infrared photocurrent generation is strongly nonlinear according to dot density, but $o\phantom{\rule{0}{0ex}}p\phantom{\rule{0}{0ex}}p\phantom{\rule{0}{0ex}}o\phantom{\rule{0}{0ex}}s\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}t\phantom{\rule{0}{0ex}}e$ to expectations, and that only low dot densities provide enhanced up-conversion photocurrent. A high density of dots is counterproductive; low-density layers can greatly outperform high-density layers. This startling discovery is essential for overcoming the limits of present-day devices. |
| Databáze: | OpenAIRE |
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