A Chemically Orthogonal Hole Transport Layer for Efficient Colloidal Quantum Dot Solar Cells
Abstract
Abstract 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%).
- Authors:
-
[1]
- Department of Electrical and Computer Engineering University of Toronto 10 King's College Road Toronto Ontario M5S 3G4 Canada
- Department of Material Science and Engineering University of Toronto 184 College St Toronto Ontario M5S 3E4 Canada
- Materials Science and Engineering Division National Institute of Standards and Technology (NIST) Gaithersburg MD 20899 USA
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1616222
- Resource Type:
- Publisher's Accepted Manuscript
- Journal Name:
- Advanced Materials
- Additional Journal Information:
- Journal Name: Advanced Materials Journal Volume: 32 Journal Issue: 17; Journal ID: ISSN 0935-9648
- Publisher:
- Wiley Blackwell (John Wiley & Sons)
- Country of Publication:
- Germany
- Language:
- English
Citation Formats
Biondi, Margherita, Choi, Min‐Jae, Ouellette, Olivier, Baek, Se‐Woong, Todorović, Petar, Sun, Bin, Lee, Seungjin, Wei, Mingyang, Li, Peicheng, Kirmani, Ahmad R., Sagar, Laxmi K., Richter, Lee J., Hoogland, Sjoerd, Lu, Zheng‐Hong, García de Arquer, F. Pelayo, and Sargent, Edward H. A Chemically Orthogonal Hole Transport Layer for Efficient Colloidal Quantum Dot Solar Cells. Germany: N. p., 2020.
Web. doi:10.1002/adma.201906199.
Biondi, Margherita, Choi, Min‐Jae, Ouellette, Olivier, Baek, Se‐Woong, Todorović, Petar, Sun, Bin, Lee, Seungjin, Wei, Mingyang, Li, Peicheng, Kirmani, Ahmad R., Sagar, Laxmi K., Richter, Lee J., Hoogland, Sjoerd, Lu, Zheng‐Hong, García de Arquer, F. Pelayo, & Sargent, Edward H. A Chemically Orthogonal Hole Transport Layer for Efficient Colloidal Quantum Dot Solar Cells. Germany. https://doi.org/10.1002/adma.201906199
Biondi, Margherita, Choi, Min‐Jae, Ouellette, Olivier, Baek, Se‐Woong, Todorović, Petar, Sun, Bin, Lee, Seungjin, Wei, Mingyang, Li, Peicheng, Kirmani, Ahmad R., Sagar, Laxmi K., Richter, Lee J., Hoogland, Sjoerd, Lu, Zheng‐Hong, García de Arquer, F. Pelayo, and Sargent, Edward H. Fri .
"A Chemically Orthogonal Hole Transport Layer for Efficient Colloidal Quantum Dot Solar Cells". Germany. https://doi.org/10.1002/adma.201906199.
@article{osti_1616222,
title = {A Chemically Orthogonal Hole Transport Layer for Efficient Colloidal Quantum Dot Solar Cells},
author = {Biondi, Margherita and Choi, Min‐Jae and Ouellette, Olivier and Baek, Se‐Woong and Todorović, Petar and Sun, Bin and Lee, Seungjin and Wei, Mingyang and Li, Peicheng and Kirmani, Ahmad R. and Sagar, Laxmi K. and Richter, Lee J. and Hoogland, Sjoerd and Lu, Zheng‐Hong and García de Arquer, F. Pelayo and Sargent, Edward H.},
abstractNote = {Abstract 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%).},
doi = {10.1002/adma.201906199},
journal = {Advanced Materials},
number = 17,
volume = 32,
place = {Germany},
year = {Fri Mar 20 00:00:00 EDT 2020},
month = {Fri Mar 20 00:00:00 EDT 2020}
}
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