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Polymer solar cells (PSCs) have been actively researched and developed as the next generation of solar cells due to their features such as flexibility, low production cost, and semitransparency, which are difficult to be achieved with silicon solar cells 1, 2, 3. These findings explain the stability improvement mechanism, showing the correlation between less charge accumulation and higher stability, which is valuable for the development of further efficient and stable polymer solar cells. The other correlation is the increase in open-circuit voltage and the N spin decrease in holes in ZnO.
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One correlation is the decrease in short-circuit current and the N spin increase in electrons on PC 61BM and holes in PTzBT, where the ITIC addition causes the less these N spin.
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We observed two correlations between device performance and number of spins ( N spin) under solar irradiation. Here, we show the stability improvement mechanism due to less charge accumulation in the PTzBT cells with ITIC using operando electron spin resonance from a microscopic viewpoint. However, the performance improvement mechanism is not completely elucidated. Ternary polymer solar cells based on a thiazolothiazole-based polymer donor (PTzBT) and a fullerene acceptor (PC 61BM) have attracted attention because they show high efficiency and stability by addition of a non-fullerene acceptor (ITIC).