Abstract
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 n-layer, which greatly enhances the photocurrent. The resulting devices showed an efficiency of 1.5%.
Original language | English |
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Article number | 035401 |
Pages (from-to) | 1-7 |
Number of pages | 7 |
Journal | Nanotechnology |
Volume | 26 |
Issue number | 3 |
DOIs | |
Publication status | Published - 23 Jan 2015 |
Externally published | Yes |
Keywords
- colloidal quantum dot
- solar cell
- quantum junction
- heterojunction