Present status and future perspectives of bifacial PERC+ solar cells and modules

Dullweber, Thorsten; Schulte‐Huxel, Henning; Blankemeyer, Susanne; Hannebauer, Helge; Schimanke, Sabrina; Baumann, Ulrike; Witteck, Robert; Peibst, Robby; Köntges, Marc; Brendel, Rolf; Yu, Yao

doi:10.7567/jjap.57.08ra01

Cited by 34 publications

(10 citation statements)

References 22 publications

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“…2 . One should note that the bifaciality of PERC+ in the range of 80% 54 allows for a significantly increased energy yield (10–20% 55 ) for utility applications. This has to be taken into account when comparing the performance with other cell structures with higher or lower bifaciality.…”

Section: Resultsmentioning

confidence: 99%

Simulation-based roadmap for the integration of poly-silicon on oxide contacts into screen-printed crystalline silicon solar cells

Kruse

Schäfer

Haase

et al. 2021

Sci Rep

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We present a simulation-based study for identifying promising cell structures, which integrate poly-Si on oxide junctions into industrial crystalline silicon solar cells. The simulations use best-case measured input parameters to determine efficiency potentials. We also discuss the main challenges of industrially processing these structures. We find that structures based on p-type wafers in which the phosphorus diffusion is replaced by an n-type poly-Si on oxide junction (POLO) in combination with the conventional screen-printed and fired Al contacts show a high efficiency potential. The efficiency gains in comparsion to the 23.7% efficiency simulated for the PERC reference case are 1.0% for the POLO BJ (back junction) structure and 1.8% for the POLO IBC (interdigitated back contact) structure. The POLO BJ and the POLO IBC cells can be processed with lean process flows, which are built on major steps of the PERC process such as the screen-printed Al contacts and the $$\text{Al}_\text{2 }\text{O}_\text{3 }/\text{SiN }$$ Al 2 O 3 / SiN passivation. Cell concepts with contacts using poly-Si for both polarities ($$\text{POLO}^2$$ POLO 2 -concepts) show an even higher efficiency gain potential of 1.3% for a $$\text{POLO}^2$$ POLO 2 BJ cell and 2.2% for a $$\text{POLO}^2$$ POLO 2 IBC cell in comparison to PERC. For these structures further research on poly-Si structuring and screen-printing on p-type poly-Si is necessary.

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Section: Resultsmentioning

confidence: 99%

Simulation-based roadmap for the integration of poly-silicon on oxide contacts into screen-printed crystalline silicon solar cells

Kruse

Schäfer

Haase

et al. 2021

Sci Rep

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“…Moreover, n-type silicon cells exhibit low recombination losses compared to p-type silicon cells, such that the former is more suitable for use in a bifacial cell configuration than the latter. Multi-wire busbar technology is attracting more attention due to the reduced resistance and enhanced light absorption associated with this approach due to increased light scattering [10]. Recently, our research group reported outdoor field test results indicating a bifacial gain in excess of 30% from a 60-cell n-type silicon bifacial module oriented to the south at an installation angle of 30 • [11], and a bifacial gain of 14.5% from a 1.8 kW bifacial PV system [12].…”

Section: Introductionmentioning

confidence: 99%

Outdoor Performance Test of Bifacial n-Type Silicon Photovoltaic Modules

Park

Chang²,

Park

et al. 2019

Sustainability

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The outdoor performance of n-type bifacial Si photovoltaic (PV) modules and string systems was evaluated for two different albedo (ground reflection) conditions, i.e., 21% and 79%. Both monofacial and bifacial silicon PV modules were prepared using n-type bifacial Si passivated emitter rear totally diffused cells with multi-wire busbar incorporated with a white and transparent back-sheet, respectively. In the first set of tests, the power production of the bifacial PV string system was compared with the monofacial PV string system installed on a grey concrete floor with an albedo of ~21% for approximately one year (June 2016–May 2017). In the second test, the gain of the bifacial PV string system installed on the white membrane floor with an albedo of ~79% was evaluated for approximately ten months (November 2016–August 2017). During the second test, the power production by an equivalent monofacial module installed on a horizontal solar tracker was also monitored. The gain was estimated by comparing the energy yield of the bifacial PV module with that of the monofacial module. For the 1.5 kW PV string systems with a 30° tilt angle to the south and 21% ground albedo, the year-wide average bifacial gain was determined to be 10.5%. An increase of the ground albedo to 79% improved the bifacial gain to 33.3%. During the same period, the horizontal single-axis tracker yielded an energy gain of 15.8%.

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“…When paired with the development of transparent back contacts, bifacial Si devices efficiencies of 19.5−22% and 17−19% have been achieved when illuminated through the front and rear of the device, respectively. 13 These values result in a bifaciality, defined as the ratio of efficiency illuminated through the back to efficiency illuminated through the front, of 85%.…”

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Understanding and Advancing Bifacial Thin Film Solar Cells

Phillips

Subedi

Liyanage

et al. 2020

ACS Appl. Energy Mater.

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Because bifacial solar cells increase the power generated per area, their market share is projected to increase over the next decade. While silicon technologies have implemented bifacial technology, little progress has occurred in bifacial thin film (BTF) solar cells. Understanding the factors that limit performance is critical to advancing BTF cells. We show that recombination at the back interface has limited device performance of fabricated BTF devices. Improved BTF performance will require decreasing recombination at the back interface, through passivation or by reducing downward band-bending at this interface. Increasing carrier lifetimes improves performance, but increasing hole density has little effect.

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Present status and future perspectives of bifacial PERC+ solar cells and modules

Cited by 34 publications

References 22 publications

Simulation-based roadmap for the integration of poly-silicon on oxide contacts into screen-printed crystalline silicon solar cells

Simulation-based roadmap for the integration of poly-silicon on oxide contacts into screen-printed crystalline silicon solar cells

Outdoor Performance Test of Bifacial n-Type Silicon Photovoltaic Modules

Understanding and Advancing Bifacial Thin Film Solar Cells

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