penghuang

In article number 1602333, Shihe Yang, Yutaka Matsuo, Hin-Lap Yip, and co-workers simultaneously optimize both the power conversion efficiency (>12.5%) and average visible transmittance (>20%) of semitransparent perovskite solar cells (ST-PVSCs) through dual interfacial modifications. The success demonstration of high performance ST-PVSCs paves the way for using them as power generating windows, as illustrated in the image.

A new non-conjugated polymer (PVCz-OMeDAD) with good solution processability was developed to serve as an efficient dopant-free hole-transporting material (HTM) for perovskite solar cells (PSCs). PVCz-OMeDAD was simply prepared by the free-radical polymerization of vinyl monomers, which were synthesized from low-cost raw materials through three high-yield synthesis steps. The combination of the flexible non-conjugated polyvinyl main chain and hole-transporting methoxydiphenylamine-substituted carbazole side chains endowed PVCz-OMeDAD with excellent film-forming ability, a suitable energy level, and high hole mobility. As a result, by using an ultra-thin (≈30 nm) PVCz-OMeDAD film as cost-effective dopant-free polymer HTM, the conventional n–i–p-type PSCs demonstrated a power conversion efficiency (PCE) up to 16.09 %, suggesting the great potential of the polymer film for future low-cost, large-scale, flexible PSCs applications.

Be flexible: By integrating a flexible polyvinyl main chain with carbazole-based hole-transporting side chains, a new non-conjugated polymer (PVCz-OMeDAD) with excellent film-forming ability and good hole mobility is designed and synthesized in high yield through a three-step reaction. By employing the ultra-thin PVCz-OMeDAD film (≈30 nm) as dopant-free hole-transporting layer, perovskite solar cells (PSCs) can realize a power conversion efficiency up to 16.09 %, suggesting the great potential of this non-conjugated polymer for future low-cost, large-scale, flexible PSCs applications.