Operational Principles of Hybrid Perovskite Solar Cells

Fujiwara, Hiroyuki; Kato, Yoshitsune; Kadoya, Yuji; Nishigaki, Youichi; Kobayashi, Takefumi; Matsushita, Akio; Matsui, Taisuke

doi:10.1002/9783527825851.ch11

Cited by 5 publications

(8 citation statements)

References 92 publications

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“…Tin iodide perovskites, with the formula ASnI 3 (where A = methylammonium (MA), formamidinium, or cesium (Cs)), have emerged as lead (Pb)-free direct-band gap semiconductors. Their band gap range is 1.2−1.4 eV, 1,2 which falls within the range of maximum power conversion efficiency (PCE) for single-junction solar cells determined by Shockley and Queisser. 3 Moreover, ASnI 3 perovskites exhibit excellent optical and electrical properties, including a high optical absorption coefficient (10 4 −10 5 cm −1 ) and carrier mobility (10 2 −10 3 cm 2 V −1 s −1 ).…”

Section: ■ Introductionsupporting

confidence: 72%

“…26 Moreover, it is oxidized even in the resulting ASnI 3 perovskites, leading to the formation of unfavorable A 2 SnI 6 phases. 5,27,28 For example, MASnI 3 perovskites are oxidized and degraded in ambient air within only 12 h. 5,18 Regarding issue (1), the addition of excess iodide ions (I − ) can enhance the solubility of SnI 2 in aqueous solutions through the formation of soluble [SnI x ] (2−x)+ complexes. 29 Hydroiodic acid (HI) is commonly used as a solubilizer for this purpose.…”

Section: ■ Introductionmentioning

confidence: 99%

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Ambient Aqueous-Phase Synthesis of Highly Stable Methylammonium Tin Iodide Perovskites Using Alkali Iodides and Ascorbic Acid

Yokoyama,

Omata,

Yokoyama

et al. 2023

ACS Appl. Energy Mater.

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Tin iodide perovskites have attracted significant attention as lead-free photoactive layers with excellent optical and electrical properties. A high demand exists for their facile and green synthesis process, not including inert environments and anhydrous organic solvents. In this study, we report a new approach for synthesizing methylammonium tin iodide (MASnI3) perovskites in an ambient aqueous phase. We used lithium iodides or sodium iodides (NaI) as stable solubilizers for tin sources and ascorbic acid (AA) as a safe reductant. Using these reagents, transparent and stable precursor aqueous solutions containing high concentrations of Sn2+ were successfully prepared, even in ambient air. Mass spectrometry analysis of the precursor aqueous solutions revealed that AA effectively stabilized the Sn2+ species in the solutions owing to its chelating and reducing abilities. We investigated the degradation process of the MASnI3 perovskites obtained from these precursor aqueous solutions through structural, chemical, and optical analyses before and after exposure to ambient air. The MASnI3 perovskites synthesized with NaI and AA exhibited remarkable stability in ambient air. Our results demonstrate that sodium ions and AA present at the surfaces synergistically prevent the oxidative degradation of the MASnI3 perovskites.

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Section: ■ Introductionsupporting

confidence: 72%

Section: ■ Introductionmentioning

confidence: 99%

Ambient Aqueous-Phase Synthesis of Highly Stable Methylammonium Tin Iodide Perovskites Using Alkali Iodides and Ascorbic Acid

Yokoyama,

Omata,

Yokoyama

et al. 2023

ACS Appl. Energy Mater.

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“…The resultant PSCs produce a champion PCE of 3.9%; although not high, it inspires further development of the PSCs of identical architectures. At present, common HTLs for inverted PSCs include PTAA, poly (3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS), NiO x , CuSCN, etc., and ETLs include [6,6]-phenyl-C61-butyric acid methyl ester (PCBM), C 60 , indene-C 60 bisadduct (ICBA), etc. Apart from the common merits of regular structures, inverted PSCs typically exhibit smaller hysteresis due to a more balanced carrier transport rate.…”

Section: Device Structure and Operationmentioning

confidence: 99%

“…In contrast, about a half‐century has been spent for silicon solar cells to reach a PCE of 26.7%. [ 6 ]…”

Section: Introductionmentioning

confidence: 99%

“…In contrast, about a half-century has been spent for silicon solar cells to reach a PCE of 26.7%. [6] Generally, 3D hybrid perovskites have a formula of ABX 3 , where A represents a monovalent cation (e.g, CH 3 NH 3 + (MA + ), HC(NH 2 ) 2 + (FA + ), or Cs + ), B is a divalent metal cation (e.g, Pb 2+ or Sn 2+ ), and X is the halide anion (e.g, Cl − , Br − , I − ). Specifically, a B site cation is sixfold coordinated with the X anions to form a 3D network of corner-sharing [BX 6 ] octahedra, and the A cations occupy the cuboctahedral cavities.…”

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confidence: 99%

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Recent Progress on Heterojunction Engineering in Perovskite Solar Cells

Wang

Deng

Cao

et al. 2022

Advanced Energy Materials

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Metal halide perovskite solar cells (PSCs) have become one of the most promising next‐generation photovoltaic technologies due to their low‐cost fabrication, solution processability, and superior optoelectronic properties. Although state‐of‐art PSCs demonstrate a power conversion efficiency record comparable to that of silicon solar cells, there are still many challenges toward commercialization. PSCs are devices based on various semiconductor heterojunctions that all play important roles in device performance. The device operation relies on a combination of multiple heterojunctions to offer a delicate control of photocarrier generation, separation, and transport to respective electrodes. Hence, advanced heterojunction design in PSCs is crucial for the further improvement of device performance. Notably, the conversion efficiency records for PSCs are mainly ascribed to optimized heterojunction engineering. Considering the significance of this topic, a comprehensive review of the recently developed heterojunction designs is presented. Following a brief introduction to PSC architectures, operation, and fundamental heterojunction design theories, the recent progress on perovskite/electron transport layer, perovskite/hole transport layer, and perovskite/perovskite heterojunction engineering is elaborated. Finally, conclusions and perspectives on this research field are addressed.

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Photophysical Ion Dynamics in Hybrid Perovskite MAPbX₃ (X=Br, Cl) Single Crystals

Papadopoulos,

Forslund,

Cottrell

et al. 2024

Advanced Physics Research

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Hybrid organic–inorganic perovskites (HOIPs) are promising candidates for next‐generation photovoltaic materials. However, there is a debate regarding the impact of interactions between the organic center and the surrounding inorganic cage on the solar cell's high diffusion lengths. It remains unclear whether the diffusion mechanism is consistent across various halide perovskite families and how light illumination affects carrier lifetimes. The focus is on ion kinetics of (CH3NH3)PbX3 (X = Br, Cl) perovskite halide single crystals. Muon spectroscopy (μ+SR)is employed to investigate the fluctuations and diffusion of ions via the relaxation of muon spins in local nuclear field environments. Within a temperature range of 30–340 K, ion kinetics are studied with and without white‐light illumination. The results show a temperature shift of the tetragonal‐orthorhombic phase transition on the illuminated samples, as an effect of increased organic molecule fluctuations. This relation is supported by density functional theory (DFT) calculations along the reduction of the nuclear field distribution width between the phase transitions. The analysis shows that, depending on the halide ion, the motional narrowing from H and N nuclear moments represents the molecular fluctuations. The results demonstrate the importance of the halide ion and the effect of illumination on the compound's structural stability and electronic properties.

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Operational Principles of Hybrid Perovskite Solar Cells

Cited by 5 publications

References 92 publications

Ambient Aqueous-Phase Synthesis of Highly Stable Methylammonium Tin Iodide Perovskites Using Alkali Iodides and Ascorbic Acid

Ambient Aqueous-Phase Synthesis of Highly Stable Methylammonium Tin Iodide Perovskites Using Alkali Iodides and Ascorbic Acid

Recent Progress on Heterojunction Engineering in Perovskite Solar Cells

Photophysical Ion Dynamics in Hybrid Perovskite MAPbX₃ (X=Br, Cl) Single Crystals

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Operational Principles of Hybrid Perovskite Solar Cells

Cited by 5 publications

References 92 publications

Ambient Aqueous-Phase Synthesis of Highly Stable Methylammonium Tin Iodide Perovskites Using Alkali Iodides and Ascorbic Acid

Ambient Aqueous-Phase Synthesis of Highly Stable Methylammonium Tin Iodide Perovskites Using Alkali Iodides and Ascorbic Acid

Recent Progress on Heterojunction Engineering in Perovskite Solar Cells

Photophysical Ion Dynamics in Hybrid Perovskite MAPbX3 (X=Br, Cl) Single Crystals

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Product

Resources

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Photophysical Ion Dynamics in Hybrid Perovskite MAPbX₃ (X=Br, Cl) Single Crystals