Flexible perovskite/silicon tandem solar cell with a dual buffer layer

"Perovskite/silicon tandem solar cells have emerged as promising candidates for next-generation photovoltaic technology due to their ultra-high power conversion efficiency (PCE)1-3. However, the mechanical stress generated during repeated environmental stress cycles remains a critical challenge for flexible perovskite/silicon tandem solar cells, leading to interfacial delamination and device degradation. In this work, we propose a dual-buffer-layer strategy with a stress-release mechanism to synergistically mitigate ion bombardment during subsequent sputtering deposition and enhance interfacial adhesion while preserving efficient charge extraction."

"We are providing an unedited version of this manuscript to give early access to its findings. Before final publication, the manuscript will undergo further editing. Please note there may be errors present which affect the content, and all legal disclaimers apply. The loose SnOx buffer layer, engineered by adjusting the purging time of atomic layer deposition, can dissipate strain energy, whereas the compact SnOx layer can ensure robust electrical contact."

Perovskite/silicon tandem solar cells offer ultra-high power conversion efficiencies and strong potential for next-generation photovoltaics. Mechanical stress from repeated environmental cycles causes interfacial delamination and device degradation in flexible tandem devices. A dual-buffer-layer strategy with a stress-release mechanism mitigates ion bombardment during sputtering deposition and improves interfacial adhesion without compromising charge extraction. The loose SnOx buffer layer, created by adjusting atomic layer deposition purging time, dissipates strain energy. The compact SnOx layer provides robust electrical contact. The combined buffer layers aim to reduce mechanical failure while maintaining device performance under repeated stress cycles.

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