Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 37, Pages 34178-34187Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b13145
Keywords
perovskite; semitransparent perovskite solar cell; silicon solar cell; tandem solar cell; efficiency
Funding
- National Research Foundation, Prime Minister's Office, Singapore, under the Energy Innovation Research Program [NRF201SEWT-EIRP003-004, NRF-CRP14-2014-03, Solar CRP: 518-1176-SCRP]
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Tandem solar cells (SCs) based on perovskite and silicon represent an exciting possibility for a breakthrough in photovoltaics, enhancing SC power conversion efficiency (PCE) beyond the single-junction limit while keeping the production cost low. A critical aspect to push the tandem PCE close to its theoretical limit is the development of high-performing semitransparent perovskite top cells, which also allow suitable near-infrared transmission. Here, we have developed highly efficient semitransparent perovskite SCs (PSCs) based on both mesoporous and planar architectures, employing Cs-0.05(MA(0.17)FA(0.83))(0.95)Pb(I0.83Br0.17)(3) and FA(0.87)Cs(0.13)PbI(2)Br perovskites with band gaps of 1.58 and 1.72 eV, respectively, which achieved PCEs well above 17 and 14% by detailed control of the deposition methods, thickness, and optical transparency of the interlayers and the semitransparent electrode. By combining our champion 1.58 eV PSCs (PCE of 17.7%) with an industrial-relevant low-cost n-type Si SCs, a four-terminal (4T) tandem efficiency of 25.5% has been achieved. Moreover, for the first time, 4T tandem SCs' performances have been measured in the low light intensity regime, achieving a PCE of 26.6%, corresponding to revealing a relative improvement above 9% compared to the standard 1 sun illumination condition. These results are very promising for their implementation under field-operating conditions.
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