Journal
NANOTECHNOLOGY
Volume 26, Issue 3, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/26/3/035401
Keywords
colloidal quantum dot; solar cell; quantum junction; heterojunction
Funding
- Program for New Century Excellent Talents in University [NCET-12-0216]
- National Natural Science Foundation of China (NSFC) [61274055]
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Here, we demonstrated the quantum heterojunction colloidal quantum dot (CQD) solar cells employing the PbS CQDs/Cd3P2 CQDs architecture in which both the p-type PbS and n-type Cd3P2 CQD layers are quantum-tunable and solution-processed light absorbers. We synthesized well-crystallized and nearly monodispersed tetragonal Cd3P2 CQDs and then engineered their energy band alignment with the p-type PbS by tuning the dot size and hence the bandgap to achieve efficient light absorbing and charge separation. We further optimized the device through the Ag-doping strategy of PbS CQDs that may leverage an expanded depletion region in the nlayer, which greatly enhances the photocurrent. The resulting devices showed an efficiency of 1.5%.
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