1 research outputs found
V<sub>2</sub>O<sub>5</sub> as Hole Transporting Material for Efficient All Inorganic Sb<sub>2</sub>S<sub>3</sub> Solar Cells
This
research demonstrates that V<sub>2</sub>O<sub>5</sub> is able
to serve as hole transporting material to substitute organic transporting
materials for Sb<sub>2</sub>S<sub>3</sub> solar cells, offering all
inorganic solar cells. The V<sub>2</sub>O<sub>5</sub> thin film is
prepared by thermal decomposition of spin-coated vanadium(V) triisopropoxide
oxide solution. Mechanistic investigation shows that heat treatment
of V<sub>2</sub>O<sub>5</sub> layer has crucial influence on the power
conversion efficiency of device. Low temperature annealing is unable
to remove the organic molecules that increases the charge transfer
resistance, while high temperature treatment leads to the increase
of work function of V<sub>2</sub>O<sub>5</sub> that blocks hole transporting
from Sb<sub>2</sub>S<sub>3</sub> to V<sub>2</sub>O<sub>5</sub>. Electrochemical
and compositional characterizations show that the interfacial contact
of V<sub>2</sub>O<sub>5</sub>/Sb<sub>2</sub>S<sub>3</sub> can be essentially
improved with appropriate annealing. The optimized power conversion
efficiency of device based on Sb<sub>2</sub>S<sub>3</sub>/V<sub>2</sub>O<sub>5</sub> heterojunction reaches 4.8%, which is the highest power
conversion efficiency in full inorganic Sb<sub>2</sub>S<sub>3</sub>-based solar cells with planar heterojunction solar cells. Furthermore,
the employment of V<sub>2</sub>O<sub>5</sub> as hole transporting
material leads to significant improvement in moisture stability compared
with the device based organic hole transporting material. Our research
provides a material choice for the development of full inorganic solar
cells based on Sb<sub>2</sub>S<sub>3</sub>, Sb<sub>2</sub>(S,Se)<sub>3</sub>, and Sb<sub>2</sub>Se<sub>3</sub>