Abstract
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.
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