# Bifaciality Optimization of TBC Silicon Solar Cells Based on Quokka3 Simulation

## TL;DR

This paper optimizes tunnel oxide-passivated back contact solar cells to achieve high efficiency and bifaciality using simulations.

## Contribution

A systematic multi-parameter co-optimization approach for TBC solar cells using Quokka3 simulation.

## Key findings

- A simulated conversion efficiency of 27.26% was achieved for TBC solar cells.
- A bifaciality ratio of 92.96% was obtained through optimization.
- Trade-off relationships between FF, bifaciality, and efficiency were quantified.

## Abstract

What are the main findings?
A simulated conversion efficiency of 27.26% and a bifaciality ratio of 92.96% have been achieved for TBC solar cells.

A simulated conversion efficiency of 27.26% and a bifaciality ratio of 92.96% have been achieved for TBC solar cells.

What are the implications of the main findings?
By considering the interaction between parameters, the optimal performance balance point was determined.An integrated opto-electrical analysis and design were specifically conducted.

By considering the interaction between parameters, the optimal performance balance point was determined.

An integrated opto-electrical analysis and design were specifically conducted.

Tunnel Oxide-Passivated Back Contact solar cells represent a next-generation photovoltaic technology with significant potential for achieving both high efficiency and low cost. This study addresses the challenge of low bifaciality inherent to the rear-side structure of TBC cells. Using the Quokka3 simulation and assuming high-quality surface passivation and fine-line printing accuracy, a systematic optimization was conducted. The optimization encompassed surface morphology, optical coatings, bulk material parameters (carrier lifetime and resistivity), and rear-side geometry (emitter fraction, metallization pattern and gap width). Through a multi-parameter co-optimization process aimed at enhancing conversion efficiency, a simulated conversion efficiency of 27.26% and a bifaciality ratio of 92.96% were achieved. The simulation analysis quantified the trade-off relationships between FF, bifaciality, and efficiency under different parameter combinations. This enables accurate prediction of final performance outcomes when prioritizing different metrics, thereby providing scientific decision-making support for addressing the core design challenges in the industrialization of TBC cells.