Optical Characteristics and Operational Principles of Hybrid Perovskite Solar Cells

Fujiwara, Hiroyuki; Kato, Masato; Tamakoshi, Masato; Miyadera, Tetsuhiko; Chikamatsu, Masayuki

doi:10.1002/pssa.201700730

Cited by 60 publications

(44 citation statements)

References 78 publications

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“…In fact, the earlier EQE analysis of the hybrid perovskite cells shows clearly that the parasitic absorption of all the component layers is very small and the efficient optical confinement is realized by metal backside reflection [24,64]. Thus, quite high efficiencies confirmed for the hybrid perovskites can be interpreted by the very low optical losses.…”

Section: Limiting Factors Of Record-efficiency Cellsmentioning

confidence: 91%

Maximum Efficiencies and Performance-Limiting Factors of Inorganic and Hybrid Perovskite Solar Cells

et al. 2019

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The Shockley and Queisser limit, a well-known efficiency limit for a solar cell, is based on unrealistic physical assumptions and its maximum limit is seriously overestimated.To understand the power loss mechanisms of record-efficiency cells, a more rigorous approach is necessary. Here, we have established a formalism that can accurately predict absolute performance limits of solar cells in conventional thin film form. In particular, a formulation for a strict evaluation of the saturation current in a nonblackbody solar cell has been developed by taking incident angle, light polarization and texture effects into account. Based on the established method, we have estimated the maximum efficiencies of 13 well-studied solar cell materials [GaAs, InP, CdTe, a-HC(NH 2 ) 2 PbI 3 ] in a 1-µm-thick physical limit. Our calculation shows that over 30% efficiencies can be achieved for absorber layers with sharp absorption edges (GaAs, InP, CdTe, CuInGaSe 2 , Cu 2 ZnGeSe 4 ). Nevertheless, many record-efficiency polycrystalline solar cells, including hybrid perovskites, are limited by open-circuit voltage and fill-factor losses. We show that the maximum conversion efficiencies described here present alternative limits that can predict the power generation of real-world solar cells. *fujiwara@gifu-u.ac.jp sc J kT qV J J −  

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Section: Limiting Factors Of Record-efficiency Cellsmentioning

confidence: 91%

Maximum Efficiencies and Performance-Limiting Factors of Inorganic and Hybrid Perovskite Solar Cells

et al. 2019

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“…Quite fortunately, exact f values can be evaluated directly by applying density functional theory (DFT) [9]. In fact, our earlier studies showed that the α spectra calculated by DFT reproduce the experimental α spectra of various photovoltaic materials almost perfectly [9,10], confirming the validity of the overall DFT calculations. These works have implied the possibility that quite detailed analyses of band-edge optical transitions can be made based on DFT.…”

Section: Introductionmentioning

confidence: 80%

Very high oscillator strength in the band-edge light absorption of zincblende, chalcopyrite, kesterite, and hybrid perovskite solar cell materials

Kato

Nishiwaki

Fujiwara

2020

Phys. Rev. Materials

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In semiconducting solar-cell absorbers, high absorption coefficient (α) near the band-edge region is critical to maximize the photocurrent generation and collection.Nevertheless, despite the importance of the band-edge absorption characteristics, the quantitative analysis of the band-edge optical transitions has not been performed. In this study, we have implemented systematic density functional theory (DFT) calculation, focusing on the band-edge oscillator strength of seven practical solar cell absorbers (GaAs, InP, CdTe, CuInSe 2 , CuGaSe 2 , Cu 2 ZnSnSe 4 , and Cu 2 ZnSnS 4 ) with zincblende, chalcopyrite and kesterite structures. We find that all these crystals exhibit the giant oscillator strength near the band gap region, revealing the fact that α in the band gap region is enhanced significantly by the anomalous high oscillator strength. In high-energy optical transitions, however, the oscillator strength reduces sharply and the absorption properties are determined primarily by the joint density-of-state contribution.Based on DFT results, we show that the giant oscillator strength in the band edge region originates from a unique tetrahedral-bonding structure, with a negligible effect of constituent atoms. * fujiwara@gifu-u.ac.jp.

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“…In this study, we focus on changing the halide anion C, which allows controlling the bandgap from narrow to wide bandgaps. The absorption coefficients of three perovskite components and crystalline silicon, taken from the literature, [ 22–27 ] is shown in Figure 2b. The absorption properties of the perovskite component match well with the visible spectral range, while the absorption of silicon extends in the near‐infrared spectral range.…”

Section: Perovskite Materials and Optical Propertiesmentioning

confidence: 99%

“…This can only be achieved by varying side C. A monovalent halide anions (I − , Cl − , or Br − ) can be placed in position C. The MAPbCl 3 , MAPbBr 3 , and MAPbI 3 perovskite materials exhibit bandgaps of 3.1, 2.3, and 1.6 eV. [ 22–27 ] The device structure of the color sensor is depicted in Figure 3a. In a first step, MAPbCl 3 , MAPbBr 3 , and MAPbI 3 are used as absorber material of the top, middle, and bottom diode, respectively.…”

Section: Perovskite Color Sensorsmentioning

confidence: 99%

Vertically Stacked Perovskite Detectors for Color Sensing and Color Vision

Qarony

Kozawa

Khan

et al. 2020

Adv Materials Inter

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Optical color sensors based on perovskites are described. These sensors overcome the limits of conventional image sensors used in smartphones and digital cameras. The sensors allow for detecting the primary colors red, green, and blue without using optical filters. The color sensors consist of vertically stacked diodes using perovskite alloys. The described sensor structure is color aliasing or color moiré error free, while conventional sensors using optical filters are limited by this error. The spectral sensitivity of vertically stacked sensors is up to three times higher than the spectral sensitivity of filter‐based color sensors. The optical constants of the required perovskite alloys are determined, and color sensors are electromagnetically modeled. The spectral sensitivities of the sensors are colorimetrically characterized and compared to sensors in the literature including conventional sensors using optical filters. This study, for the first time, shows that a vertically stacked three color sensor exhibits a color error equal to, or smaller than, errors of conventional sensors using optical filters. Details on the used materials, the device design, and the colorimetric analysis are provided.

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Optical Characteristics and Operational Principles of Hybrid Perovskite Solar Cells

Cited by 60 publications

References 78 publications

Maximum Efficiencies and Performance-Limiting Factors of Inorganic and Hybrid Perovskite Solar Cells

Maximum Efficiencies and Performance-Limiting Factors of Inorganic and Hybrid Perovskite Solar Cells

Very high oscillator strength in the band-edge light absorption of zincblende, chalcopyrite, kesterite, and hybrid perovskite solar cell materials

Vertically Stacked Perovskite Detectors for Color Sensing and Color Vision

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