Donor–acceptor conjugates-functionalized zinc phthalocyanine: Towards broad absorption and application in organic solar cells

New zinc phthalocyanine (ZnPc-TDA), peripherally functionalized with donor–acceptor conjugates was synthesized, and its optical, thermal, electrochemical, and photovoltaic properties were studied. The black ZnPc-TDA exhibited both excellent solubility in common organic solvents, and broad absorption covering the range 300–900 nm. The photovoltaic devices with the configuration of ITO/PEDOT-PSS/ZnPc-TDA:PCBM/LiF/Al produced short circuit current densities of 2.26 mA/cm2, the open circuit voltage of 0.68 V and power conversion efficiency of 0.4% under AM1.5G illumination.