研究目的
To address the heat management issue in quantum-dot intermediate band solar cells (QD-IBSCs) under high concentrated illumination by proposing a method to reduce Joule heating loss and increase VOC through the use of a wide bandgap cell as a current constraint cell.
研究成果
The study demonstrates a 32.1% efficiency under 225 suns with a bonded InGaP/GaAs widegap cell // InAs-InGaAs quantum dash (QD) SC configuration. The current constraint method is effective in controlling the photocurrent generated in QD-IBSC, reducing Joule heating loss under high concentrated illuminations, and increasing VOC. A higher overall FF than for a single-junction QD-IBSC is achievable due to the higher FF of the top widegap subcells.
研究不足
The photocurrent production in each subcell, particularly in the InGaP top cell, can be further optimized. The study is focused on the specific configuration of InGaP/GaAs widegap cell bonded to InAs-InGaAs quantum dash SC, and its applicability to other configurations or materials is not explored.
1：Experimental Design and Method Selection:
The study involves the fabrication of an n-i-p In
2：53Ga47As cell with InAs quantum dashes on InP (001) substrate by solid-source molecular beam epitaxy (MBE) and the preparation of an inverted InGaP/GaAs tandem cell structure grown on GaAs substrate as a top current constraint cell. Sample Selection and Data Sources:
InP (001) substrate and GaAs substrate were used for the bottom and top cells, respectively.
3：List of Experimental Equipment and Materials:
Solid-source MBE, InP (001) substrate, GaAs substrate, In
4：53Ga47As, InAs quantum dashes, In52Al48As, InGaP, GaAs, MgF2/ZnS anti-reflection layer. Experimental Procedures and Operational Workflow:
The fabrication process includes thermal cleaning, buffer and base layer growth, quantum dash layer growth, emitter and window layer growth, substrate removal, direct bonding, and deposition of contact electrodes and anti-reflection layer.
5：Data Analysis Methods:
The solar cell performance was studied by external quantum efficiency (EQE) measurements and current-voltage (J-V) characteristics under AM1.5G solar simulator and concentrated illumination using a pulse solar simulator.
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