Progress in the research of high-efficiency indoor photoorganic photovoltaic cells in the Institute of Chemistry

Organic photovoltaic cells have long been celebrated for their lightweight design, flexibility, and the ability to tune their absorption spectrum. These features make them particularly promising for indoor lighting applications. Over the past few years, there's been significant progress in enhancing the photovoltaic performance of these cells under indoor lighting conditions. However, the inherent energy disorder in organic semiconductor materials tends to broaden the density of states, which can severely restrict the open-circuit voltage and overall energy conversion efficiency in low-light settings. This limitation presents notable challenges for their practical use. Through the application of light-concentrating technology, the adverse effects of energy disorder can be mitigated by increasing the incident light flux. Yet, prior studies on the photovoltaic performance and stability of organic photovoltaic cells in such concentrated environments remain scarce. Hou Jianhui’s team at the Institute of Chemistry, Chinese Academy of Sciences, conducted an in-depth investigation into how energy disorder impacts the performance of organic photovoltaic cells in low-light environments and explored their photovoltaic characteristics under concentrated lighting scenarios. Their study focused on three classic active layer systems: PBDB-TF:Y6, PB2:FCC-Cl, and PTB7-Th:PC71BM. The findings reveal that indoor lighting conditions can effectively counteract the negative impacts of energy disorder, enhancing both the open-circuit voltage and fill factor of the devices, thereby achieving superior photovoltaic efficiency. Notably, the PB2:FCC-Cl-based device reached a photovoltaic efficiency of 29.0% under 500 lux illumination, which surged to 33.0% when concentrated to 20,000 lux. This represents the highest indoor light performance recorded under similar conditions. Furthermore, due to the more gentle nature of indoor lighting, all tested devices exhibited impressive stability under concentrated indoor light conditions. Among them, the PBDB-TF:Y6 system demonstrated the most robust morphological stability, with a fitted T80 lifetime—measuring the time it takes for efficiency to drop to 80% of its initial value—exceeding 30,000 hours under indoor lighting. In addition, the team found that devices fabricated using a scraping method, measuring just 0.25 cm², could outperform 10 cm² large-area devices in terms of photovoltaic efficiency and output power at 500 lux. Combining this approach with optical waveguide concentrating technology, they demonstrated that concentrating organic photovoltaic cells not only simplifies production processes but also reduces costs, presenting significant potential for widespread indoor lighting applications. These findings were recently published in *Joule*. The image below illustrates the remarkable combination of high performance, high stability, ease of processing, and affordability offered by indoor photoorganic photovoltaic cells. [Image description: A diagram showing an indoor photovoltaic cell setup, highlighting its compact design and efficiency under various lighting conditions.] Indoor photovoltaic cells are proving to be a game-changer, blending advanced technology with practical usability, and opening new avenues for renewable energy solutions.

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