Hole-Conductor-Free
Mesoscopic TiO<sub>2</sub>/CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> Heterojunction Solar Cells Based
on Anatase Nanosheets and Carbon Counter Electrodes
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Abstract
A hole-conductor-free fully printable
mesoscopic TiO<sub>2</sub>/CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> heterojunction solar
cell was developed with TiO<sub>2</sub> nanosheets containing high
levels of exposed (001) facets. The solar cell embodiment employed
a double layer of mesoporous TiO<sub>2</sub> and ZrO<sub>2</sub> as
a scaffold infiltrated by perovskite as a light harvester. No hole
conductor or Au reflector was employed. Instead, the back contact
was simply a printable carbon layer. The perovskite was infiltrated
from solution through the porous carbon layer. The high reactivity
of (001) facets in TiO<sub>2</sub> nanosheets improved the interfacial
properties between the perovskite and the electron collector. As a
result, photoelectric conversion efficiency of up to 10.64% was obtained
with the hole-conductor-free fully printable mesoscopic TiO<sub>2</sub>/CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> heterojunction solar
cell. The advantages of fully printable technology and the use of
low-cost carbon-materials-based counter electrode and hole-conductor-free
structure provide this design a promising prospect to approach low-cost
photovoltaic devices