Maximizing carrier extraction in hybrid back-contact silicon solar cells
Article Date: 10 March 2026
Article URL: https://www.nature.com/articles/s41586-026-10351-8
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Summary
This Nature research article reports optimisation strategies for hybrid back-contact (BC) crystalline silicon solar cells that combine TOPCon-derived n-type contacts, SHJ-derived p-type contacts and an interdigitated back-contact architecture. The team used a multifunctional front layer for combined light trapping and surface passivation, improved rear carrier-selective contacts for better carrier collection and found the optimal wafer thickness increases to 160 μm. The result is an industrially compatible cell reaching a certified efficiency of 27.62%.
Author style: Punchy — the paper is technical but the take-home is clear: tweak the front and rear contact designs and thickness, and you get near-record, manufacturable performance.
Key Points
- Hybrid BC cells combine strengths of TOPCon (n-type) and SHJ (p-type) contacts with an interdigitated back-contact layout.
- A multifunctional front layer was developed to deliver both light trapping and surface passivation.
- Rear carrier-selective contacts were optimised to improve carrier collection and process compatibility.
- The optimal crystalline silicon absorber thickness was raised to 160 μm for this architecture.
- The optimisations produced an industrially compatible cell with a certified efficiency of 27.62%.
- The work clarifies why the hybrid BC architecture can outperform conventional BC designs (for example by eliminating front metallisation shading and improving extraction).
Content Summary
The authors systematically analyse and exploit the design flexibility of hybrid back-contact solar cells. They integrate a multifunctional front surface that simultaneously enhances light trapping and provides effective passivation, reducing front-surface losses without reintroducing shading from metallisation.
On the rear side, the team refines carrier-selective contact stacks to raise carrier collection efficiency while keeping the process steps compatible with industrial fabrication. Through device optimisation and thickness studies they identify 160 μm as an optimal absorber thickness for the hybrid BC design, balancing optical absorption and carrier extraction.
Combining these measures yields an industrially compatible crystalline silicon solar cell with a certified efficiency of 27.62%, demonstrating that the hybrid BC approach can reach very high efficiencies without sacrificing manufacturability.
Context and Relevance
Improvements in wafer-based silicon cell efficiency still have big value for the PV industry because small absolute gains translate to significant module- and system-level improvements. This paper is relevant to PV researchers, cell/module manufacturers and process engineers focused on scaling high-efficiency concepts into production.
The findings tie into ongoing trends: hybrid contact schemes (mixing best contact technologies), reducing optical losses from front metallisation, and adjustments to wafer thickness to optimise cost-versus-performance in manufacturing lines.
Why should I read this?
Quick and honest — if you care about squeezing more efficiency out of silicon cells without inventing brand-new fabs, this is worth five minutes. The team shows concrete, process-friendly tweaks (front-layer multitasking, smarter rear contacts, and a thicker wafer choice) that push certified efficiency to 27.62%. If you work in PV R&D or manufacturing, this could save you design-and-test cycles.