Matching Charge Extraction Contact for Infrared PbS Colloidal Quantum Dot Solar Cells

Infrared solar cells (IRSCs) can supplement silicon or perovskite SCs to broaden the utilization of the solar spectrum. As an ideal infrared photovoltaic material, PbS colloidal quantum dots (CQDs) with tunable bandgaps can make good use of solar energy, especially the infrared region. However, as t...

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Bibliographic Details
Published in:Small (Weinheim an der Bergstrasse, Germany) Germany), 2022-01, Vol.18 (1), p.e2105495-n/a
Main Authors: Li, Mingyu, Chen, Shiwu, Zhao, Xinzhao, Xiong, Kao, Wang, Bo, Shah, Usman Ali, Gao, Liang, Lan, Xinzheng, Zhang, Jianbing, Hsu, Hsien‐Yi, Tang, Jiang, Song, Haisheng
Format: Article
Language:English
Subjects:
colloidal quantum dots
Energy conversion efficiency
energy level matching
Energy levels
Infrared radiation
infrared solar cells
lead sulfide
Magnetron sputtering
Matching
Nanotechnology
Open circuit voltage
Optoelectronics
Passivity
Perovskites
Photovoltaic cells
Quantum dots
Sol-gel processes
Solar cells
Solar energy
sputtered ZnO
Storage stability
Thin films
Zinc oxide
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Summary:Infrared solar cells (IRSCs) can supplement silicon or perovskite SCs to broaden the utilization of the solar spectrum. As an ideal infrared photovoltaic material, PbS colloidal quantum dots (CQDs) with tunable bandgaps can make good use of solar energy, especially the infrared region. However, as the QD size increases, the energy level shrinking and surface facet evolution makes us reconsider the matching charge extraction contacts and the QD passivation strategy. Herein, different to the traditional sol‐gel ZnO layer, energy‐level aligned ZnO thin film from a magnetron sputtering method is adopted for electron extraction. In addition, a modified hybrid ligand recipe is developed for the facet passivation of large size QDs. As a result, the champion IRSC delivers an open circuit voltage of 0.49 V and a power conversion efficiency (PCE) of 10.47% under AM1.5 full‐spectrum illumination, and the certified PCE is over 10%. Especially the 1100 nm filtered efficiency achieves 1.23%. The obtained devices also show high storage stability. The present matched electron extraction and QD passivation strategies are expected to highly booster the IR conversion yield and promote the fast development of new conception QD optoelectronics. PbS colloidal quantum dot infrared solar cells can supplement silicon or perovskite solar cells. The energy level evolution of large size PbS quantum dots makes us reconsider the matching charge extraction contacts. The sputtered ZnO based device obtains a certified power conversion efficiency of over 10%, and the 1100 nm filtered efficiency achieves 1.23%.
ISSN:1613-6810
1613-6829
DOI:10.1002/smll.202105495