Joule: Breaking the record! 100 degrees stable for 6000 hours! Efficient and Stable Organic Solar Cells

Although the power conversion efficiency (PCE) of organic solar cells (OSCs) based on small molecule acceptors (SMAs) has been significantly improved, their long-term stability is not sufficient for commercialization. Recently, Yun-Hi Kim, Bumjoon J. Kim of Gyeongsang University, and Bumjoon J. Kim of Korea Institute of Science and Technology used dimer small molecule acceptors to realize efficient and stable organic solar cells.

The authors found that dimerization of SMA can significantly enhance the stability of SMA-based OSCs, and dimeric SMA (DYBO) can obtain OSCs with high PCE (>18%), which enables them to outperform their monomeric counterparts based on MYBO. (PCE=17.1%) OSCs. In addition, DYBO-based OSCs have excellent thermal and photostability.

DYBO-based OSCs maintained more than 80% of their initial PCE even after continuous exposure at 100 °C for 6000 h, while MYBO-based OSCs degraded to ~80% of their initial PCC values within 36 h. The high stability of DYBO-based OSCs is mainly attributed to the high glass transition temperature (Tg) of DYBO of 179 °C (Tg = 80 °C for MYBO) and improved blend miscibility, thus stabilizing its co-polymers under thermal stress. mixture form.