The efficiency of halide perovskite solar cells has progressed rapidly through a series of major breakthroughs. Currently, a certified efficiency of 25.2% has been achieved for a solar cell using a polycrystalline thin film. This is the result of having reached 75% of the Shockley-Queisser limit for single-junction solar cells. However, for further improvements, new breakthrough technologies are required. This article reviews the impact of previous breakthrough technologies on the efficiency of halide perovskite solar cells, based on certified efficiencies. We clarify the current status of halide perovskite solar cells and introduce photon recycling as the next technological innovation for higher efficiencies. Photon recycling keeps the photon concentration inside the light-harvesting layer high, and consequently, leads to open-circuit voltages close to the theoretical value. Although photon recycling has not yet been implemented in real halide perovskite solar cells, three key technologies for implementing it are examined.
Bibliographical noteFunding Information:
We acknowledge support from the National Research Foundation of Korea (NRF) Grant funded by the Korean Government (MSIP) (NRF-2020R1A2C3009115, NRF-2017M1A2A2087351 [the Technology Development Program to Solve Climate Changes], and NRF-2017M3A6A7051089 [Global Frontier R&D Program on Center for Multiscale Energy Systems]).
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ASJC Scopus subject areas
- General Materials Science
- Condensed Matter Physics
- Physical and Theoretical Chemistry