Journal
ACS ENERGY LETTERS
Volume 3, Issue 4, Pages 869-874Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.8b00207
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Funding
- Cambridge Nehru Bursary
- Cambridge Bombay Society Fund
- Trinity-Henry Barlow Scholarship
- Haidar Scholarship
- Rana Denim Pvt. Ltd.
- Agency of Science, Technology and Research (A*STAR) Singapore
- Engineering and Physical Science Research Council (EPSRC) [EP/M005143/1, EP/P02484X/1]
- St John's College, Cambridge
- Engineering and Physical Sciences Research Council [EP/M024881/1] Funding Source: researchfish
- EPSRC [EP/M024881/1, EP/M005143/1, EP/P02484X/1] Funding Source: UKRI
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Metal-halide perovskite-based tandem solar cells show great promise for overcoming the Shockley-Queisser single-junction efficiency limit via low-cost tandem structures, but so far, they employ conventional bottom-cell materials that require stringent processing conditions. Meanwhile, difficulty in achieving low-bandgap (<1.1 eV) perovskites limits all-perovskite tandem cell development. Here we propose a tandem cell design based on a halide perovskite top cell and a chalcogenide colloidal quantum dot (CQD) bottom cell, where both materials provide bandgap tunability and solution processability. A theoretical efficiency of 43% is calculated for tandem-cell bandgap combinations of 1.55 (perovskite) and 1.0 eV (CQDs) under 1-sun illumination. We highlight that intersubcell radiative coupling contributes significantly (>11% absolute gain) to the ultimate efficiency via photon recycling. We report an initial experimental demonstration of a solution-processed monolithic perovskite/CQD tandem solar cell, showing evidence for subcell voltage addition. We model that a power conversion efficiency of 29.7% is possible by combining state-of-the-art perovskite and CQD solar cells.
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