Slow Hot‐Carrier Cooling in Halide Perovskites: Prospects for Hot‐Carrier Solar Cells
- 2 January 2019
- journal article
- review article
- Published by Wiley in Advanced Materials
- Vol. 31 (47), e1802486
- https://doi.org/10.1002/adma.201802486
Abstract
Rapid hot‐carrier cooling is a major loss channel in solar cells. Thermodynamic calculations reveal a 66% solar conversion efficiency for single junction cells (under 1 sun illumination) if these hot carriers are harvested before cooling to the lattice temperature. A reduced hot‐carrier cooling rate for efficient extraction is a key enabler to this disruptive technology. Recently, halide perovskites emerge as promising candidates with favorable hot‐carrier properties: slow hot‐carrier cooling lifetimes several orders of magnitude longer than conventional solar cell absorbers, long‐range hot‐carrier transport (up to ≈600 nm), and highly efficient hot‐carrier extraction (up to ≈83%). This review presents the developmental milestones, distills the complex photophysical findings, and highlights the challenges and opportunities in this emerging field. A developmental toolbox for engineering the slow hot‐carrier cooling properties in halide perovskites and prospects for perovskite hot‐carrier solar cells are also discussed.Keywords
Funding Information
- Nanyang Technological University (M4080514)
- Japan Society for the Promotion of Science (M4082176)
- Ministry of Education - Singapore (RG173/16, MOE2015‐T2‐2‐015, MOE2016‐T2‐1‐034)
- National Research Foundation Singapore (NRF‐CRP14‐2014‐03, NRF‐NRFI‐2018‐04)
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