Quantification of pn-Junction Recombination in Interdigitated Back-Contact Crystalline Silicon Solar Cells

Spinelli, Pierpaolo; Loo, Bas W. H. van de; Vlooswijk, A.H.G.; Kessels, W.M.M.; Cesar, I.

doi:10.1109/jphotov.2017.2714134

Cited by 14 publications

(6 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Many institutes such as Fraunhofer ISE, ECN, and ISC-Konstanz are now working on IBC solar cells and their commercialization [3,4]. Some manufacturers such as SunPower and Trina have achieved over 24% efficiency on large area solar cells [5,6].…”

Section: Introductionmentioning

confidence: 99%

Efficient Low-Cost IBC Solar Cells with a Front Floating Emitter: Structure Optimization and Passivation Layer Study

et al. 2018

View full text Add to dashboard Cite

Abstract:In this paper, we investigate interdigitated back contact solar cells with the front floating emitter structure systematically by using simulated and experimental methods. By comparing the front floating emitter structure with the front surface field structure, it is found that the efficiency of solar cells with the front surface field structure quickly reduces with the increasing of back surface field width; while solar cells with the front floating emitter structure can have a wider front surface field width range with minimum impact on the cell efficiency. More importantly, solar cells with the front floating emitter structure have a larger fabrication process tolerance, especially for the back surface field width, emitter width, and the bulk resistivity, which means that the fabrication process flow can be simplified and the production cost can be reduced. Based on the above results, large area (156.75 mm × 156.75 mm) interdigitated back contact solar cells with the front floating emitter structure are fabricated by using the simplified process with only one masking step. SiO x :B is used as the passivation layer, which can lead to a higher open circuit voltage and lower surface saturation current density. Finally, an efficiency of 20.39% is achieved for the large area solar cells.

show abstract

Section: Introductionmentioning

confidence: 99%

Efficient Low-Cost IBC Solar Cells with a Front Floating Emitter: Structure Optimization and Passivation Layer Study

et al. 2018

View full text Add to dashboard Cite

show abstract

“…Furthermore, the “buried emitter” and the “floating base” solar cells exhibit a much lower V oc and FF compared to the “reference” solar cells, implying that besides a higher recombination in the overcompensated diffusion region also non‐ideal recombination due to additional junction and/or shunt leakage currents exist. The deleterious effect of additional leakage currents when n‐ and p‐type regions are overlapping was observed before for SiO 2 or Al 2 O 3 passivated diffusions . However, there are also cases where no significant influence of an overlap of n‐ and p‐type regions on the performance was observed .…”

Section: Resultsmentioning

confidence: 66%

Back‐Contacted Back‐Junction Si Solar Cells with Locally Overcompensated Diffusion Regions – Comparison of Buried Emitter and Floating Base Design

Reichel

Fell

Hermle

et al. 2019

Physica Status Solidi (a)

View full text Add to dashboard Cite

Back-contacted back-junction n-type Si solar cells with locally overcompensated diffusion regions are investigated in two different designs. In the "buried emitter" design, boron-doped (B-doped) emitter diffusions are partially diffused and locally overcompensated by phosphor-doped (P-doped) back surface field (BSF) diffusions, leading to n-type regions that are overlapping the p-type regions. In the "floating base" design, the B-diffusions are diffused on the entire rear side, so that the P-diffusions are separated from the base by the emitter. Hence, p-type regions exist between the n-type regions, creating opposing p-n junctions and a base that is floating. For the latter design with an efficiency of 17.1%, the open-circuit voltage V oc , the short-circuit current density J sc , and the fill factor FF are significantly reduced by about 25 mV, 5 mA cm À2 , and 4%, respectively, compared to the buried emitter design where 678 mV, 41.5 mA cm À2 , and 76.1%, respectively, and an efficiency of 21.4% can be achieved. Two-dimensional numerical device simulations reveal that, besides junction and/or shunt leakage currents, recombination at the surface of the emitter and electron transport in the Band P-diffusions due to the opposing p-n junctions are detrimental for the performance of the "floating base" solar cell.

show abstract

“…The ΔFF Rsh exhibited a significant suppression from 2.0% to 1.3% due to the ideal interfacial morphology preventing current leakage. The ΔFF J02 induced by J 02 recombination is primarily related to Shockley-Read-Hall (SRH) recombination, [49,51] which decreased from 0.9% for the BC-processed device to 0.6% for the SD-processed device. These results exemplify that the SD processing improves the FF mainly by improving charge transport properties, and a further reduction of R s is required to boost the FF to a higher level for all-PSCs.…”

Section: Ff Ff Ffmentioning

confidence: 99%

Boosting the Fill Factor through Sequential Deposition and Homo Hydrocarbon Solvent toward Efficient and Stable All‐Polymer Solar Cells

Wang

Han

et al. 2022

Advanced Energy Materials

View full text Add to dashboard Cite

All‐polymer solar cells (all‐PSCs) have achieved impressive progress in photovoltaic performance and stabilities recently. However, their power conversion efficiencies (PCEs) still trail that of small‐molecular acceptor‐based organic solar cells (>19%) mainly because of the inferior fill factor (FF). Herein, a combined homo hydrocarbon solvent and sequential deposition (SD) strategy is presented to boost the FF of rigid all‐PSCs to 77.7% and achieve a superior PCE of 17.7% with excellent stability, which is among the highest efficiencies reported for all‐PSCs thus far. Meanwhile, a remarkable PCE of 14.5% is realized for flexible all‐PSCs with outstanding mechanical stability. The blend film morphologies measurements suggest that the SD method enables the formation of an ideal pseudo‐bilayer film with bicontinuous interdigitated structure and ordered polymer packing. The numerical simulation result indicates that the FF enhancement mainly results from the efficient exciton diffusion dynamics, increased carrier mobilities, and more balanced electron/hole mobility ratio induced by the developed SD method. This is also confirmed by the FF loss analysis, which manifests that the reduced series resistance and increased shunt resistance are the main reasons for the reduction of FF loss. This work provides a promising strategy to fabricate highly efficient and stable all‐PSCs to promote their future development and practical manufacturing.

show abstract

Quantification of pn-Junction Recombination in Interdigitated Back-Contact Crystalline Silicon Solar Cells

Cited by 14 publications

References 23 publications

Efficient Low-Cost IBC Solar Cells with a Front Floating Emitter: Structure Optimization and Passivation Layer Study

Efficient Low-Cost IBC Solar Cells with a Front Floating Emitter: Structure Optimization and Passivation Layer Study

Back‐Contacted Back‐Junction Si Solar Cells with Locally Overcompensated Diffusion Regions – Comparison of Buried Emitter and Floating Base Design

Boosting the Fill Factor through Sequential Deposition and Homo Hydrocarbon Solvent toward Efficient and Stable All‐Polymer Solar Cells

Contact Info

Product

Resources

About