Twist‐Compensated Conjugation Enables Efficient and Scalable Semi‐Transparent Organic Solar Cells

ABSTRACT Semi‐transparent organic solar cells (ST‐OSCs) are promising for lightweight, color‐tunable, solution‐processed window‐ and building‐integrated photovoltaics. However, narrow‐bandgap acceptors for near‐infrared (NIR) harvesting often exhibit excessive aggregation, poor coating tolerance, and reduced visible transparency, hindering the simultaneous realization of high efficiency, high average visible transmittance (AVT), and scalable fabrication. Here, we develop a twist‐compensated conjugation strategy to design the NIR acceptor GJ‐2, paired with the visible‐window donor PCE10. Peripheral steric twisting within a highly delocalized framework suppresses over‐aggregation and broadens the crystallization window while maintaining suitable energy levels and strong NIR absorption. The PCE10:GJ‐2 blend reduces non‐radiative recombination and enables balanced charge transport without external optical management layers. Opaque devices achieve a record PCE of 14.93%, while semi‐transparent devices deliver a benchmark PCE of 10.40%, a device AVT of 42.89% (active‐layer AVT: 57.68%), and a light utilization efficiency (LUE) of 4.50%. Scalable modules reach efficiencies of 12.66% (opaque) and 9.44% (semi‐transparent), with a module LUE of 4.05%. These results demonstrate twist‐compensated conjugation as an effective strategy for efficient, scalable ST‐OSCs.