<p>➀ Study reveals organic solar cells exhibit unexpected 're-entrant mixing' where polymer-SMA blends separate when heated and remix when cooled, challenging classical material models;</p><p>➁ Researchers developed an advanced framework incorporating free volume and glass transition temperature to explain phase behavior, enabling better prediction of solar cell stability;</p><p>➂ This breakthrough paves the way for designing high-efficiency organic solar cells with improved thermal stability for renewable energy applications.</p>