Citation: Mingxu Zhang, Qisen Zhou, Xinyi Mei, Jingxuan Chen, Junming Qiu, Xiuzhi Li, Shuang Li, Mubing Yu, Chaochao Qin, Xiaoliang Zhang. Colloidal Quantum Dot Solids with a Diminished Epitaxial PbI₂ Matrix for Efficient Infrared Solar Cells[J]. Acta Physico-Chimica Sinica, ;2023, 39(3): 221000. doi: 10.3866/PKU.WHXB202210002 shu

Colloidal Quantum Dot Solids with a Diminished Epitaxial PbI₂ Matrix for Efficient Infrared Solar Cells

1.
School of Materials Science and Engineering, Beihang University, 100191 Beijing, China
2.
Henan Key Laboratory of Infrared Materials & Spectrum Measures and Applications, School of Physics, Henan Normal University, Xinxiang 453007, Henan Province, China

Corresponding author: Xiaoliang Zhang, xiaoliang.zhang@buaa.edu.cn
Received Date: 5 October 2022
Revised Date: 11 November 2022
Accepted Date: 24 November 2022
Available Online: 2 December 2022
Fund Project: the National Natural Science Foundation of China 51872014the National Natural Science Foundation of China 12074104the Fundamental Research Funds for the Central Universities, and the "111" project B17002

Colloidal quantum dots (CQDs) are extremely promising infrared optoelectronic materials for efficient solar cells owing to their strong infrared absorption with tunable spectra. However, the liquid-state ligand exchange of CQDs using ammonium acetate (AA) as an additive generally resulted in intensive charge-transport barriers within the CQD solids. This is induced by the high-bandgap PbI₂ matrix, which considerably affects the charge-carrier extraction of CQD solar cells (CQDSCs), and thus their photovoltaic performance. Herein, dimethylammonium iodide (DMAI) was used as an additive instead for the liquid-state ligand exchange, substantially eliminating the PbI₂ matrix capping the CQDs and simultaneously restraining CQD fusion during the ligand exchange, thereby reducing the barriers for the charge-carrier transport within the CQD solids. Extensive experimental studies and theoretical calculations were performed to link the surface chemistry of the CQDs with the charge-carrier dynamics within the CQD solids and full solar cell devices. The theoretical calculation results reveal that DMAI which possess small dissociation energy could finely regulate the ligand exchange of CQDs, resulting in the suppressed energetic disorder and diminished charge-transport barriers in the CQD solids compared to those of the CQD solids prepared using AA. The DMAI-treated quantum dots were characterized and analyzed by transmission electron microscopy, X-ray photoelectron spectroscopy, and 2D grazing-incidence wide-and small-angle X-ray scattering spectrometry. The results show PbI₂-related Bragg peaks in the AA-treated CQD solid films, indicating a thick layer of PbI₂ crystal matrix being formed in the CQD solids, whereas there was no obvious PbI₂ signal observed in DMAI-treated CQD solids. These results also demonstrate that DMAI provides additional I⁻, improving the surface passivation of the CQDs and reducing trap-assisted recombination. For the infrared photovoltaic applications, the CQDSC devices were fabricated, which shows that the photovoltaic performance of CQDSCs was significantly improved. The power conversion efficiency of DMAI-based CQDSCs was improved by 17.8% compared with that of the AA-based CQDSC. The charge-carrier dynamics in both CQD solids and full solar cell devices were analyzed in detail, revealing that the improved photovoltaic performance in DMAI-based CQDSCs was attributed to the facilitated charge-carrier transport within the CQD solids and suppressed trap-assisted recombination, resulting from eliminated charge-transport barriers and improved surface passivation of CQDs, respectively. This work provides a new avenue to controlling the surface chemistry of infrared CQDs and a feasible approach to substantially diminishing the charge transfer barriers of CQD solids for infrared solar cells.
- Colloidal quantum dot,
- Surface chemistry,
- Charge transfer barrier,
- Infrared solar cell,
- Ligand exchange
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Colloidal Quantum Dot Solids with a Diminished Epitaxial PbI2 Matrix for Efficient Infrared Solar Cells

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Colloidal Quantum Dot Solids with a Diminished Epitaxial PbI₂ Matrix for Efficient Infrared Solar Cells