Scientists achieve 29.1% efficiency in PEDOT:PSS-free perovskite tandem solar cells

PEDOT:PSS is commonly used as a hole transport layer in perovskite solar cells because it combines high transparency, good conductivity, and suitable energy-level alignment, but its moisture sensitivity and acidity can damage perovskite layers and limit long-term stability. In contrast, replacing…

First covered Jun 15, 2026 · 10:55 PM PT · 1 article · no longer in the live window