A D–π–A Organic Dye as a Passivator to Effectively Regulate the Performance of Perovskite Solar Cells. Issue 7 (24th May 2022) - Zhang, Tian
Abstract : The lattice defects in perovskite solar cells comprising polycrystalline films affect the cell's humidity stability and photovoltaic performance. Herein, a donor–pi–acceptor organic dye molecule (ZT001 ) containing a carboxyl group on the acceptor moiety and long alkyl chains on the donor moiety is synthesized and used as an effective passivator in perovskite solar cells. It is revealed in the results that the carboxyl group of ZT001 successfully passivates the film defects by forming coordination with uncoordinated Pb 2+, and the humidity stability of the device is improved and maintained above 80% of the original photoelectric conversion efficiency (PCE). Therefore, ZT001 ‐passivated perovskite devices exhibit a superior PCE of 20.6% compared with the PCE of unpassivated devices (19.5%). Abstract : Herein, a donor–pi–acceptor organic dye molecule (ZT001 ) containing a carboxyl group and long carbon chains is employed to efficiently passivate the defects in the perovskite and enhance the hydrophobicity of perovskite solar cells, yielding an excellent photoelectric conversion efficiency of 20.6%.