High efficiency near-infrared (NIR) absorbing solar cells based on lead phthalocyanine (PbPc) are reported using copper
iodide (CuI) as a templating layer to control the crystal structure of PbPc. Devices with CuI inserted between the ITO
and PbPc layers exhibit a two times enhancement of the JSC compared to the case in the absence of the CuI layer. This is
due to the increase of crystallinity in the molecules grown on the CuI templating layer, which is investigated via an x-ray
diffraction study. Moreover, fill factor is also enhanced to 0.63 from 0.57 due to low series resistance although the
additional CuI layer is inserted between the ITO and the PbPc layer. As a result, the corrected power conversion
efficiency of 2.5% was obtained, which is the highest one reported up to now among the PbPc based solar cells.