Screen‐Printed Borosilicate Glass Derived from Sol–Gel Materials for Back‐Contact Back‐Junction Solar Cells

Huyeng, Jonas D.; Efinger, Raphael; Keding, Roman; Doll, O.; Clement, Florian

doi:10.1002/solr.202000271

Cited by 2 publications

(5 citation statements)

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“…When new paste is added to the screen (marked by “*”), m wet is initially increased but then decreases again. We have previously shown that the decay of G′ and G″ can be influenced by the frequency of the amplitude sweep, but G″ always exceeds G′ [ 3 ]. By measuring τ as a function of the shear rate

(not shown), we also verified that both pastes behave as shear-thinning liquids.…”

Section: Resultsmentioning

confidence: 99%

“…It can therefore be assumed that the different synthesis process and additives used to improve the printing process do not have a significant influence on the use of the BSG-paste as a dopant source. Additionally, the achieved sheet resistances of about R □ ≈ 50 Ω/□ are sufficient for the fabrication of IBC solar cells [ 3 ].…”

Section: Discussionmentioning

confidence: 99%

“…The liquid state of the sol-gel material makes it very flexible in terms of applications and it is also attractive for additive printing. In photovoltaic (PV) research, sol-gel materials have been suggested for use in anti-reflective coatings [ 1 ], dielectric passivation layers [ 2 ] or, recently, as dopant sources [ 3 ]. In most cases, the application technology of choice is spin-on deposition.…”

Section: Introductionmentioning

confidence: 99%

“…Another factor, which affects the costs of generated electricity from solar cells, is the photo conversion efficiency [ 4 ]. The solar cell structure, which allows for the highest efficiency for a single-junction silicon solar cell, is the so-called “interdigitated back-contact” (IBC) structure [ 3 , 5 , 6 ]. Here, all contacts are placed on the rear side, thus eliminating optical reflections on the front side.…”

Section: Introductionmentioning

confidence: 99%

“…In previous work, we have shown that, in combination with screen printing, a sol-gel-derived BSG can be used as a cost-effective dopant source for IBC solar cells [ 3 ]. This process can be used to avoid costlier deposition (e.g., PECVD).…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Screen Printable Sol-Gel Materials for High-Throughput Borosilicate Glass Film Production

Huyeng

Efinger²,

Bruge³

et al. 2022

Molecules

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The use of sol-gel materials can simplify the industrial fabrication of high-efficiency silicon solar cells if a suitable deposition method is established. In this work, we investigate the possibilities to adapt a borosilicate glass sol-gel to provide a stable screen printing process. This material has previously been used as a boron dopant source for silicon solar cells. We now use an adjusted synthesis process, with an increased gelling time and different additives. This changes the rheological properties (i.e., the elastic and viscous moduli G’ and G’’) in a way that avoids the dripping of paste through the screen and that stabilizes the material transfer in subsequent printing steps. Using this synthesis process, we were able to show a printing process with long-term stability of more than 500 prints. When comparing the adjusted to the initial paste, we show that, after thermal treatment, the obtained thin films are very similar in terms of their constitution, with a refractive index between n = 1.47 (initial) and n = 1.55 (adjusted). We also show that they provide the same amount of doping under the tested conditions (950 °C, 30 min), resulting in sheet resistances of R□ = (42.5 ± 2.6) Ω/□ (initial) and R□ = (46.4 ± 3.6) Ω/□ (adjusted).

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(not shown), we also verified that both pastes behave as shear-thinning liquids.…”

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%