<p>➀ Researchers at Chemnitz University of Technology are working on developing cost-effective, printable organic solar cells, but slow electron movement causes transport resistance, reducing power output.</p><p>➁ Their latest research uncovers the root causes of this issue and explores potential solutions for improving performance.</p><p>➂ Despite transport resistance being a significant limiting factor, there are no fundamental barriers to achieving high-efficiency printed organic solar cells.</p>