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A Chemically Orthogonal Hole Transport Layer for Efficient Colloidal Quantum Dot Solar Cells
Open accessAbstract
Colloidal quantum dots (CQDs) are of interest in light of their solution‐processing and bandgap tuning. Advances in the performance of CQD optoelectronic devices require fine control over the properties of each layer in the device materials stack. This is particularly challenging in the present best CQD solar cells, since these employ a p‐type hole‐transport layer (HTL) implemented using 1,2‐ethanedithiol (EDT) ligand exchange on top of the CQD active layer. It is established that the high reactivity of EDT causes a severe chemical modification to the active layer that deteriorates charge extraction. By combining elemental mapping with the spatial charge collection efficiency in CQD solar cells, the key materials interface dominating the subpar performance of prior CQD PV devices is demonstrated. This motivates to develop a chemically orthogonal HTL that consists of malonic‐acid‐crosslinked CQDs. The new crosslinking strategy preserves the surface chemistry of the active layer beneath, and at the same time provides the needed efficient charge extraction. The new HTL enables a 1.4× increase in charge carrier diffusion length in the active layer; and as a result leads to an improvement in power conversion efficiency to 13.0% compared to EDT standard cells (12.2%).
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EDT can soak the 1.3 μm PbS-TBAI layer underneath, resulting in a change of doping to p-type.
“EDT, known for its high reactivity compared to TBAI, 40 can soak the 1.3 μ m PbS-TBAI layer underneath, resulting in a change of doping to p-type.”
From A silicon photonics waveguide-coupled colloidal quantum dot photodiode sensitive beyond 1.6 µ m (2024) · cites this paper as [40]
The passage on EDT treatment (section labeled Abstract; page unavailable) says thiols may penetrate the underlying CQD active layer, and XPS results suggest EDT replaces some of its original PbI2 ligands. It does not report a 1.3 μm PbS-TBAI layer or show that the underlying layer changes to p-type; the paper describes the EDT hole-transport layer, not the underlying active layer, as p-type. (LLM, conf=0.88)
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A silicon photonics waveguide-coupled colloidal quantum dot photodiode sensitive beyond 1.6 µ m
Pang, C., Deng, Y.-H., Kheradmand, E., Hagelsieb, L. M., Guo, Y., Cheyns, D., Geiregat, P., Hens, Z., & Van Thourhout, D. (2024) · APL Photonics · doi:10.1063/5.0206386 · Cited by 9
Metadata
- Authors
- Biondi, M., Choi, M., Ouellette, O., Baek, S., Todorović, P., Sun, B., Lee, S., Wei, M., Li, P., Kirmani, A. R., Sagar, L. K., Richter, L. J., Hoogland, S., Lu, Z., García de Arquer, F. P., & Sargent, E. H.
- Affiliations
- University of Toronto (CA)
- Department of Electrical and Computer Engineering University of Toronto 10 King's College Road Toronto Ontario M5S 3G4 Canada
- National Institute of Standards and Technology (US)
- Corresponding author
- Sargent, Edward H.
- ORCID
- Venue
- Advanced Materials
- Publisher
- Wiley
- Published
- 2020-03-20
- Volume
- 32
- Issue
- 17
- Pages
- e1906199-e1906199
- ISSN
- 0935-9648 (ISSN-L)
- 1521-4095
- PMC
- PMC13531663
- OpenAlex
- W3012399519
- Cited by
- 106
- References
- 1
- Citations by year
- 2026: 13 · 2025: 14 · 2024: 20 · 2023: 10 · 2022: 15 · 2021: 22 · 2020: 12
- FWCI
- 5.74
- Type
- journal article
- Language
- en
- Open access
- Licence
- Locations
- Advanced Materials (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- TSpace (University of Toronto) (submittedVersion)
- OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (submittedVersion)
- Funders
- Natural Sciences and Engineering Research Council of Canada
- Brookhaven National Laboratory (DE‐SC0012704)
- Topics
- Physical Sciences › Materials Science › Materials Chemistry › Quantum Dots Synthesis And Properties
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Organic Electronics and Photovoltaics
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › TiO2 Photocatalysis and Solar Cells
- Keywords
- colloidal quantum dot solar cells, hole transport layer, charge extraction, carrier diffusion length, power conversion efficiency, elemental mapping
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