Journal
APPLIED PHYSICS LETTERS
Volume 106, Issue 22, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4922150
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Funding
- University Grant Council of the University of Hong Kong [201311159056]
- General Research Fund [HKU711813, HKU711612E]
- Collaborative Research Fund [C7045-14E]
- RGC-NSFC Grant from the Research Grants Council of Hong Kong Special Administrative Region, China [N_HKU709/12]
- CAS-Croucher Funding Scheme for Joint Laboratories [CAS14601]
- National Natural Science Foundation of China [61201122]
- Hong Kong UGC Special Equipment Grant [SEG HKU09]
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With the consideration of photon recycling effect, the efficiency limit of methylammonium lead iodide (CH3NH3PbI3) perovskite solar cells is predicted by a detailed balance model. To obtain convincing predictions, both AM 1.5 spectrum of Sun and experimentally measured complex refractive index of perovskite material are employed in the detailed balance model. The roles of light trapping and angular restriction in improving the maximal output power of thin-film perovskite solar cells are also clarified. The efficiency limit of perovskite cells (without the angular restriction) is about 31%, which approaches to Shockley-Queisser limit (33%) achievable by gallium arsenide (GaAs) cells. Moreover, the Shockley-Queisser limit could be reached with a 200 nm-thick perovskite solar cell, through integrating a wavelength-dependent angular-restriction design with a textured light-trapping structure. Additionally, the influence of the trap-assisted nonradiative recombination on the device efficiency is investigated. The work is fundamentally important to high-performance perovskite photovoltaics. (C) 2015 AIP Publishing LLC.
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