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Diluted-CdS Quantum Dot-Assisted SnO2 Electron Transport Layer with Excellent Conductivity and Suitable Band
Zheng Lv1, Li He1, Haipeng Jiang1
1Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Changchun 130013, China.
ACS Applied Materials & Interfaces
|March 31, 2021
Summary
This study introduces a novel, low-temperature fabricated tin oxide (SnO2) electron transport layer (ETL) enhanced with cadmium sulfide quantum dots (CdS QDs). This composite ETL significantly boosts the efficiency and stability of perovskite solar cells (PSCs).
Area of Science:
- Materials Science
- Renewable Energy
- Nanotechnology
Background:
- Efficient planar perovskite solar cells (PSCs) require electron transport layers (ETLs) with high conductivity and optimal band alignment for effective charge extraction.
- Current ETLs often face limitations in performance and fabrication processes, hindering the widespread adoption of PSCs.
Purpose of the Study:
- To develop a novel, low-temperature processed electron transport layer (ETL) for planar perovskite solar cells (PSCs) using a composite of tin oxide (SnO2) and cadmium sulfide quantum dots (CdS QDs).
- To investigate the impact of CdS QD incorporation on the structural, electrical, and energy level properties of the SnO2 ETL and its subsequent effect on PSC performance and stability.
Main Methods:
- Fabrication of SnO2 electron transport layers (ETLs) with varying concentrations of diluted cadmium sulfide quantum dots (CdS QDs) via a low-temperature process.
- Characterization of the structural, morphological, and electrical properties of the developed ETLs, including conductivity and band alignment.
- Fabrication and performance testing of methylammonium lead iodide (MAPbI3)-based planar perovskite solar cells (PSCs) utilizing the modified ETLs.
Main Results:
- The addition of CdS QDs enhanced the crystallinity and flatness of the SnO2 ETL, leading to improved perovskite layer quality.
- The composite ETL exhibited a tenfold increase in electrical conductivity and optimized energy level alignment with the perovskite absorber layer.
- Perovskite solar cells (PSCs) employing the CdS QD-assisted SnO2 ETL achieved a maximum power conversion efficiency of 20.78% and demonstrated improved operational stability in ambient conditions.
Conclusions:
- The developed diluted CdS QD-assisted SnO2 ETL is a promising strategy for enhancing the performance and stability of planar perovskite solar cells (PSCs).
- Semiconductor quantum dot modification of ETLs offers a viable pathway for advancing photovoltaic technologies and achieving higher efficiencies in solar energy conversion.
