Cost versus environment? Combined life cycle, techno‐economic, and circularity assessment of silicon‐ and perovskite‐based photovoltaic systems

Abstract

Photovoltaics will play a key role in future energy systems, but their full potential may not be realized until their life cycles are optimized for circularity and overall sustainability. Methods that quantify flows of compound and minor element mixtures, rather than non-mixed elemental flows, are needed to prospectively analyze and predict inventory and performance for complex technology life cycles. This study utilizes process simulation to resolve the mass and energy balances needed to rigorously analyze these complexities in circular systems. Using physics-based prospective inventory data, we simultaneously assess the environmental and techno-economic performance of three photovoltaic life cycles and predict the effects of circularity on resource efficiency, carbon footprint, and levelized cost of electricity. One inventory dataset is generated per life cycle to ensure alignment between assessments and to identify trade-offs between environmental and techno-economic performance with respect to circularity, so linking circularity and sustainability. The linked material and energy resource and techno-economic models allow for the impacts of carbon taxation and the moderating effects of circularity to be explored. In addition to the clear environmental benefits of increased circularity, we find that it could dampen the cost impact of taxation. While confirming that perovskite-based modules, single junction or in tandem with silicon, clearly outperform the silicon market standard both techno-economically and environmentally, we show that maximum circularity does not automatically deliver the most sustainable outcome. The approach enables assessment of the combined impacts of specific technological, commercial, and policy choices made by different actors along the photovoltaic value chain. This article met the requirements for a gold-gold JIE data openness badge described at http://jie.click/badges.

Scenario-based recycling strategies for perovskite-silicon tandem solar cells: a harmonized life cycle assessment study

“…Concerning the recycling phase, the data for the recycling of PSK and c-Si semi-cells were obtained from the life cycle inventories published by Tian et al 54 and Latunussa et al 58 The recycling process is considered to initiate with a mechanical treatment where the aluminium frame and the encapsulation materials are removed followed by the spatial separation of the PSK/c-Si cells. 67,68 Further recycling steps for the PSK top and c-Si bottom-semi-cell take place after the physical treatment.…”