Amorphous/Crystalline Si Heterojunction Solar Cells

Fujiwara, Hiroyuki

doi:10.1007/978-3-319-75377-5_9

Cited by 5 publications

(5 citation statements)

References 79 publications

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“…Further possible effects are for instance interference enhanced Raman scattering [ 55 ] effects or different dielectric properties of the nucleation region and so polarizability of the Si–H modes leading to lower Raman scattering intensities. [ 25 ] In addition, a high amount of hydrogen in the nucleation layer can extend the band gap of the aSi:H. [ 56 ] This is detrimental to the absorption of the 532 nm laser and therefore to the resonance Raman effect maybe occurring at the a‐Si:H bulk material. [ 57 ]…”

Section: Discussionmentioning

confidence: 99%

Insights into the Si─H Bonding Configuration at the Amorphous/Crystalline Silicon Interface of Silicon Heterojunction Solar Cells by Raman and FTIR Spectroscopy

Fischer,

Lambertz,

Nuys

et al. 2023

Advanced Materials

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In silicon heterojunction (SHJ) solar cell technology, thin layers of hydrogenated amorphous silicon (a‐Si:H) are applied as passivating contacts to the crystalline silicon (c‐Si) wafer. Thus, the properties of the a‐Si:H is crucial for the performance of the solar cells. One important property of a‐Si:H is its microstructure which can be characterized by the microstructure parameter R based on Si‐H bond stretching vibrations. A common method to determine R is Fourier transform infrared (FTIR) absorption measurement which, however, is difficult to perform on solar cells by various reasons like the use of textured Si wafers and the presence of conducting oxide contact layers. Here, we demonstrate that Raman spectroscopy is suitable to determine the microstructure of bulk a‐Si:H layers of 10 nm or less on textured c‐Si underneath indium tin oxide as conducting oxide. We perform a detailed comparison of FTIR and Raman spectra and find significant differences of the microstructure parameter obtained by both methods with decreasing a‐Si:H film thickness.This article is protected by copyright. All rights reserved

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Section: Discussionmentioning

confidence: 99%

Insights into the Si─H Bonding Configuration at the Amorphous/Crystalline Silicon Interface of Silicon Heterojunction Solar Cells by Raman and FTIR Spectroscopy

Fischer,

Lambertz,

Nuys

et al. 2023

Advanced Materials

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“…[ 44 ] Surface roughness can strongly affect light scattering. [ 45 ] The complex refractive index or dielectric function tensor, which provides access to fundamental physical parameters, is related to various sample properties, including morphology, crystal quality, chemical composition, and electrical conductivity. [ 46 ] X‐ray diffraction (XRD)‐based characterization techniques, including conventional laboratory‐based XRD and synchrotron‐based grazing‐incidence wide‐angle X‐ray scattering (GIWAXS) (Figure 2c), are widely used to provide information on a material's crystallographic structure, phases, preferred crystal orientations, chemical composition, and other physical properties related to the crystallinity of the material.…”

Section: Perovskite Interface Properties and Characterizationsmentioning

confidence: 99%

Interface Engineering for Highly Efficient and Stable Perovskite Solar Cells

Zhao,

Zhang,

Krishna

et al. 2023

Advanced Optical Materials

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The ongoing global research and development efforts on perovskite solar cells (PSCs) have led the power conversion efficiency to a high record of 26.1%. The optimization of PSC processing methods, the development of new compositions, and the introduction of passivation strategies are key factors behind the meteoric rise in performance. In particular, defect passivation and mitigation of ion migration via molecular engineering of the interfaces have played a critical role in enhancing the photovoltaic performance and operational stability of PSCs. The key interface engineering strategies enabling highly stable and efficient PSCs are focused here. The interface chemistry and the deleterious impact associated with it are discussed. The molecular design of effective modulators to mitigate the negative effects of perovskite interfaces is elaborated along with advanced characterization techniques to probe the interfaces. The progress of interface modification by multiple strategies is presented, and different modulator designs that are proven to be effective in mitigating the negative effects of perovskite interfaces are highlighted. Moreover, the main properties of effective interface modification strategies are summarized, and general design principles are deduced for future applications. Here, important insights are provided into the fields of material chemistry, physical chemistry, and optoelectronics.

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“…In both cases, a transfer matrix approach uses spectra in ε and thickness of each layer assuming parallel interfaces to serve as input to simulate absorbance within each layer and reflectance from the device structure. The ARC simulations calculate reflectance by linearly connecting the minimum reflectance points obtained in the simulation, assuming planar interfaces 32 to approximate antireflection effects due to scattering at interfaces. In the ideal case, each photon absorbed within the perovskite photogenerates an electron-to-hole pair, which contributes to the maximal EQE and J SC .…”

Section: ■ Experimental Detailsmentioning

confidence: 99%

Implications of Electron Transport Layer and Back Metal Contact Variations in Tin–Lead Perovskite Solar Cells Assessed by Spectroscopic Ellipsometry and External Quantum Efficiency

Bordovalos

Subedi

Chen

et al. 2023

ACS Appl. Mater. Interfaces

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The structural and optical properties of hybrid organic–inorganic metal halide perovskite solar cells are measured by spectroscopic ellipsometry to reveal an optically distinct interfacial layer among the back contact metal, charge transport, and absorber layers. Understanding how this interfacial layer impacts performance is essential for developing higher performing solar cells. This interfacial layer is modeled by Bruggeman effective medium approximations (EMAs) to contain perovskite, C60, BCP, and metal. External quantum efficiency (EQE) simulations that consider scattering, electronic losses, and the formation of nonparallel interfaces are created with input derived from ellipsometry structural-optical models and compared with experimental EQE to estimate optical losses. This nonplanar interface causes optical losses in short circuit current density (J SC) of up to 1.2 mA cm–2. A study of glass/C60/SnO2/Ag or Cu and glass/C60/BCP/Ag film stacks shows that C60 and BCP mix, but replacing BCP with SnO2 can prevent mixing between the ETLs to prevent contact between C60 and back contact metal and enable the formation of a planar interface between ETLs and back contact metals.

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Amorphous/Crystalline Si Heterojunction Solar Cells

Cited by 5 publications

References 79 publications

Insights into the Si─H Bonding Configuration at the Amorphous/Crystalline Silicon Interface of Silicon Heterojunction Solar Cells by Raman and FTIR Spectroscopy

Insights into the Si─H Bonding Configuration at the Amorphous/Crystalline Silicon Interface of Silicon Heterojunction Solar Cells by Raman and FTIR Spectroscopy

Interface Engineering for Highly Efficient and Stable Perovskite Solar Cells

Implications of Electron Transport Layer and Back Metal Contact Variations in Tin–Lead Perovskite Solar Cells Assessed by Spectroscopic Ellipsometry and External Quantum Efficiency

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