Large Area Monofacial Screen-Printed Rear-Emitter nPERT Cells Approaching 23% Efficiency
| Autor: | Tous, L., Chen, J., Choulat, P., Singh, S., Van Der Heide, A.S.H., Aleman, M., Kuzma-Filipek, I., John, J., Duerinckx, F., Szlufcik, J. |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: | |
| DOI: | 10.4229/35theupvsec20182018-2bo.3.1 |
| Popis: | 35th European Photovoltaic Solar Energy Conference and Exhibition; 354-358 In this paper, we present a simple processing sequence to fabricate large area (244.3 cm2) n-type Czochralski-grown (Cz) monofacial screen-printed rear-emitter Passivated Emitter, Rear Totally diffused (nPERT) cells that can be implemented in production as an upgrade to conventional p-type Cz Passivated Emitter Rear Cell (p- Cz PERC) manufacturing. We use conventional POCl3 and BBr3 tube diffusions, selective n++ laser doping from phosphorous silicate glass (PSG), atomic layer deposited (ALD) Al2O3 emitter passivation, and front and rear screenprinting metallization using commercially available pastes and conventional calendered mesh screens. In a first experiment optimizing rear emitter contact pitch, we achieve average cell energy conversion efficiencies of 22.6±0.1% (internal measurement). In a second experiment implementing fine line double printing (FLDP) and double antireflective coating (DARC), we improve average conversion efficiencies to 22.8±0.1% (internal measurement) with the champion cell measured at 23.03% (externally confirmed). Finally, we identify main loss mechanisms using Free Energy Loss Analysis (FELA) and perform Quokka2D simulations to define a feasible roadmap towards >24% efficiencies. |
| Databáze: | OpenAIRE |
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