Modeling and Understanding of Rear Junction Double-Side Passivated Contact Solar Cells with Selective Area TOPCon on Front

Huang, Ying-Yuan; Jain, Aditi; Choi, Wook-Jin; Madani, Keeya; Ok, Young-Woo; Rohatgi, Ajeet

doi:10.1109/pvsc43889.2021.9518628

Modeling and Understanding of Rear Junction Double-Side Passivated Contact Solar Cells with Selective Area TOPCon on Front

Journal Article · Sun Jun 20 00:00:00 UTC 2021 · Conference Record of the IEEE Photovoltaic Specialists Conference

DOI:https://doi.org/10.1109/pvsc43889.2021.9518628· OSTI ID:2282748

Huang, Ying-Yuan ^[1]; Jain, Aditi ^[2]; Choi, Wook-Jin ^[2]; Madani, Keeya ^[2]; Ok, Young-Woo ^[2]; Rohatgi, Ajeet ^[2]

Georgia Institute of Technology, Atlanta, GA (United States); Georgia Tech Research Corporation
Georgia Institute of Technology, Atlanta, GA (United States)

Device modeling is performed to propose > 25% efficient industry-compatible rear junction double-side passivated contacts solar cell structure with full area p-TOPCon on the rear and selective area n-TOPCon under the front grid pattern (selective TOPCon). Here, this design enables the use of thicker TOPCon (>100nm) on the front for traditional screen-printed contacts without incurring metal-induced damage, high parasitic absorption loss, and compromise in lateral transport or carrier collection on the front. Rear junction design with appropriate bulk lifetime and resistivity combination eliminate the need for heavy doping in the front field region because carriers can flow through the bulk Si without appreciable FF loss. High VOC is maintained because high-quality Si surface passivation in the field region by Al₂O₃/SiN gives J₀ comparable to the TOPCon. Our device modeling specifies the practically achievable properties and parameters for each region, including full area rear p-TOPCon, selective area front n-TOPCon, bulk and contacts, to achieve 25.4% efficiency screen-printed bifacial rear junction selective TOPCon cells.

View Accepted Manuscript (DOE)

Research Organization:: Georgia Tech Research Corporation, Atlanta, GA (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office

Grant/Contract Number:: EE0008562; EE0009350

OSTI ID:: 2282748

Journal Information:: Conference Record of the IEEE Photovoltaic Specialists Conference, Journal Name: Conference Record of the IEEE Photovoltaic Specialists Conference; ISSN 0160-8371

Publisher:: IEEECopyright Statement

Country of Publication:: United States

Language:: English

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14 SOLAR ENERGY
TOPCon
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Modeling and Understanding of Rear Junction Double-Side Passivated Contact Solar Cells with Selective Area TOPCon on Front

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