Photovoltaic (PV) waste, associated to the exponentially growing PV installations on global scale, presents today an emerging environmental challenge but also brings unprecedented and multifold value creation opportunities. In this context, significant PV business and research and development (R&D) efforts shift towards establishing a more sustainable, environmentally friendly and economically viable end-of-life (EoL) management for PV modules: including recycling, recovery of raw materials, repair/refurbishment and even re-use of decommissioned or failed PV modules. In the CIRCUSOL project, PV partners aspire to formalize the repair/refurbish and reuse value chains in the PV industry and propose a circular business model, based on a product-service system (PSS). Towards these goals, this review study introduces the relevant research groundwork, a status overview and today's R&D and business challenges in PV recycling, repair/refurbishment and re-certification aspects for second-life PV modules. The topics and the relevant reported literature are examined from both circular economy and technology perspective. The review indicates a considerable technological and operational know-how in PV EoL management that already exists and continuously evolves in mature PV markets. On the other hand, R&D in repair/refurbishment of decommissioned and/or failed PV modules remains scarce, and best practices and commercial services for reliability testing/recertification and trading of second-life PV modules are neither standardized nor consolidated into any PSS or business model.

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Climate change forces countries and organisations to transition towards renewable energies (RE). The transition requires a substantial amount of renewable energy installations, such as PV (photovoltaic) systems. EU solar cells (main PV panels component) manufacturing capacity in 2019 were only 0,2% compared to the world producers' capacity. It makes the European Union energy transition dependable on the foreign countries. In addition, the supply chain of the solar industry is facing issues of silicon solar panels having critical raw material (CRM) silver and toxic materials such as lead. The solar panels themselves are a complex combination of components making recovery of the materials a difficult process (Ha, 2020). These and further issues of the lack of circularity in the solar value chain endangers reliable access to solar energy in the long term. The goal of this research is to increase the circularity in the industry by designing technologically the product in a circular way. In order to achieve this goal, the authors blended information provided in the contemporary scientific literature with the shared expertise of producers and other stakeholders. Insights about the possible technological design changes of the solar panels, their issues, and their impact on the supply chain were gathered through an online workshop and EU Horizon 2020 * The authors acknowledge the valuable contribution of all project partners within CIRCUSOL (call: H2020-EU.3.5.4). This project has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement 776680.

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The EU crystalline silicon (c‐Si) PV manufacturing industry has faced strong foreign competition in the last decade. To strive in this competitive environment and differentiate itself from the competition, the EU c‐Si PV manufacturing industry needs to (1) focus on highly performing c‐Si PV technologies, (2) include sustainability by design, and (3) develop differentiated PV module designs for a broad range of PV applications to tap into rapidly growing existing and new markets. This is precisely the aim of the 3.5 years long H2020 funded HighLite project, which started in October 2019 under the work program LC‐SC3‐RES‐15‐2019: Increase the competitiveness of the EU PV manufacturing industry. To achieve this goal, the HighLite project focuses on bringing two advanced PV module designs and the related manufacturing solutions to higher technology readiness levels (TRL). The first module design aims to combine the benefits of n‐type silicon heterojunction (SHJ) cells (high efficiency and bifaciality potential, improved sustainability, rapidly growing supply chain in the EU) with the ones of shingle assembly (higher packing density, improved modularity, and excellent aesthetics). The second module design is based on the assembly of low‐cost industrial interdigitated back‐contact (IBC) cells cut in half or smaller, which is interesting to improve module efficiencies and increase modularity (key for application in buildings, vehicles, etc.). This contribution provides an overview of the key results achieved so far by the HighLite project partners and discusses their relevance to help raise the EU PV industries' competitiveness. We report on promising high‐efficiency industrial cell results (24.1% SHJ cell with a shingle layout and 23.9% IBC cell with passivated contacts), novel approaches for high‐throughput laser cutting and edge re‐passivation, module designs for BAPV, BIPV, and VIPV applications passing extended testing, and first 1‐year outdoor monitoring results compared with benchmark products.