Polyimide for silicon solar cells with double-sided textured pyramids

Zin, Ngwe; McIntosh, Keith R.; Bakhshi, Sara; Vázquez‐Guardado, Abraham; Kho, Teng; Fong, Kean Chern; Stocks, Matthew; Franklin, Evan; Blakers, Andrew

doi:10.1016/j.solmat.2018.03.015

Cited by 24 publications

(11 citation statements)

References 39 publications

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“…The processing speed for de-agglomeration is set to 90 rpm (4). Obtained pastes include air bubbles after the milling process due to the high paste viscosity (5). These bubbles are removed using the non-contact planetary mixer with the same settings as in the previous mixing step (6).…”

Section: Process Route For Silver Paste Preparationmentioning

confidence: 99%

“…Photovoltaic (PV) systems, namely solar cells, play a key role due to their robustness and virtually maintenance-free operation over long time periods (> 25 years). Today more than 90% of the globally installed PV systems are based on silicon wafer technology which despite of its maturity still is a matter of current research [4,5] and screenprinting is the dominant production technology for front-and rear-side metallization of these silicon (Si) solar cells [6,7] due to its easy implementation and its high through-put (currently up to 4000 wafers/h on a single line) [8]. This economically attractive technology is one of the key factors enabling the recent improvement of solar cell efficiency and cost reduction.…”

Section: Introductionmentioning

confidence: 99%

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Non-volatile free silver paste formulation for front-side metallization of silicon solar cells

Yüce

Okamoto²,

Karpowich³

et al. 2019

Solar Energy Materials and Solar Cells

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We present a versatile, cost-effective formulation platform for highly conductive silver pastes used in front-side metallization of silicon (Si) solar cells. Pastes based on the capillary suspension concept include silver particles, glass frit and two immiscible fluids. Capillary forces inferred from the second fluid added only in small fractions induce the formation of a percolating particle network. This provides extended shelf-life and distinct flow properties adjustable in a wide range as demanded by the respective printing process, thus yielding residual-free sintered electrodes. Si-wafers are successfully metallized with such pastes using conventional screen-printing, knotless screen and Pattern Transfer Printing™. Paste spreading is studied via high-speed imaging during screenprinting on glass plates. Morphology of printed lines is analyzed using laser scanning microscopy. Electrical properties of the cells are characterized employing a solar simulator and electroluminescence spectroscopy. Results are compared to those obtained using commercial pastes including the same silver particles and glass frits. Paste performance strongly depends on the selected secondary fluid. Aspect ratios ≈0.4-0.5 can be reached and cell efficiencies η eff ≈ 21% on Cz-and 18.6% on mc Si-wafers are obtained. Additional investigations are necessary to further reduce paste spreading and line interruptions thus improving cell performance.

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Section: Process Route For Silver Paste Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Non-volatile free silver paste formulation for front-side metallization of silicon solar cells

Yüce

Okamoto²,

Karpowich³

et al. 2019

Solar Energy Materials and Solar Cells

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“…The charge transfer complex (CTC) has been proven to be formed with the diamine unit as the electron donator and the dianhydride unit as the electron acceptor [10][11][12]. Up to now, most of the research has been focused on eliminating or prohibiting the CTC formation in the PI molecular chains so as to afford colorless and transparent PI (CPI) films, which have been highly desired in advanced optoelectronic applications, such as flexible display, solar energy systems, and so on [13][14][15][16]. However, in some applications, PI films with enhanced CTC formation are also desirable due to the specific functionalities of such PI films [17].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Properties of Inherently Black Polyimide Films with Extremely Low Coefficients of Thermal Expansion and Potential Applications for Black Flexible Copper Clad Laminates

et al. 2020

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In the current work, a series of black polyimide (PI) films with excellent thermal and dimensional stability at elevated temperatures were successfully developed. For this purpose, two aromatic diamines including 4,4′-iminodianline (NDA) and 2-(4-aminophenyl)-5- aminobenzimidazole (APBI) were copolymerized with pyromellitic dianhydride (PMDA) to afford PIs containing imino groups (–NH–) in the molecular structures. The referenced PI film, PI-ref, was simultaneously prepared from PMDA and 4,4′-oxydianiline (ODA). The introduction of imino groups endowed the PI films with excellent blackness and opaqueness with the optical transmittance lower than 2% at the wavelength of 600 nm at a thickness of 25 μm and lightness (L*) below 10 for the CIE (Commission International Eclairage) Lab optical parameters. Meanwhile, the introduction of rigid benzimidazole units apparently improved the thermal and dimensional stability of the PI films. The PI-d film based on PMDA and mixed diamines (NDA:APBI = 70:30, molar ratio) showed a glass transition temperature (Tg) of 445.5 °C and a coefficient of thermal expansion (CTE) of 8.9 × 10−6/K in the temperature range of 50 to 250 °C, respectively. It is obviously superior to those of the PI-a (PMDA-NDA, Tg = 431.6 °C; CTE = 18.8 × 10−6/K) and PI-ref (PMDA-ODA, Tg = 418.8 °C; CTE: 29.5 × 10−6/K) films.

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“…[41][42][43][44] For example, ultra-thin textures such as grating, prism arrays, micro-lens, nanopillars, nanopyramids and nanoholes had been extensively investigated. [45][46][47][48][49][50][51] These randomly textured surfaces and periodic photonic structures could be easily manufactured by wet etching, low-pressure deposition, and nanoimprint lithography techniques. [52,53] Roozbeh et.al [54] designed and analyzed the effects of ZnO nanorods and plasmonic nanoparticles on the performance on the perovskite solar cell.…”

Section: Introductionmentioning

confidence: 99%

Design of Biomimetic Leaf-type Hierarchical Nanostructure for Enhancing the Solar Energy Harvesting of Ultra-thin Perovskite Solar Cells

Liang¹,

Lin²,

Wang³

et al. 2020

ES Energy Environ.

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Ultra-thin perovskite solar cell had the advantages of low cost, high efficiency and flexibility, which had significant potential in application. However, a severe optical loss was often observed in the ultra-thin perovskite solar cell due to the insufficient light absorption. In this study, inspired by the efficient light harvesting of hierarchical structure in leaf, a biomimetic leaf-type hierarchical nanostructure was introduced for designing highly efficient ultra-thin perovskite solar cell. In detail, three layers of hexagonal arrays of silica nanoparticles with different radius constructed the biomimetic leaf-type hierarchical structure. The biomimetic leaf-type hierarchical nanostructure was optimized by finite-difference time-domain method combined with particle swarm optimization algorithm to reduce the light reflection and increase the light absorption of the ultra-thin perovskite solar cell. The results indicated that biomimetic leaf-type hierarchical nanostructure could enhance the light absorption of ultra-thin perovskite solar cell by maximum 39% at the long wavelength. The photocurrent of the perovskite solar cell with biomimetic leaf-type hierarchical nanostructure was 8.4% higher than that of perovskite solar cell without biomimetic

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Polyimide for silicon solar cells with double-sided textured pyramids

Cited by 24 publications

References 39 publications

Non-volatile free silver paste formulation for front-side metallization of silicon solar cells

Non-volatile free silver paste formulation for front-side metallization of silicon solar cells

Preparation and Properties of Inherently Black Polyimide Films with Extremely Low Coefficients of Thermal Expansion and Potential Applications for Black Flexible Copper Clad Laminates

Design of Biomimetic Leaf-type Hierarchical Nanostructure for Enhancing the Solar Energy Harvesting of Ultra-thin Perovskite Solar Cells

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