Journal
ACS NANO
Volume 3, Issue 11, Pages 3638-3648Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn901139d
Keywords
nanocrystal; PbSe; ZnO; quantum dot; solar cell; excitonic solar cell
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Funding
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0754792] Funding Source: National Science Foundation
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We report a new type of excitonic solar cell based on planar heterojunctions between PbSe semiconductor nanocrystals and thin ZnO films. These solar cells generate large photocurrents and higher photovoltages compared to Schottky cells assembled with similar nanocrystal films. When illuminated with 100 mW/cm(2) simulated AM1.5 spectrum, these solar cells exhibit short-circuit currents between 12 and 15 mA/cm(2), open-circuit voltages up to 0.45 V, and a power conversion efficiency of 1.6%. The photovoltage depends on the size of the nanocrystals, increasing linearly with their effective band gap energy.
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