ALD grown absorber materials for bulk heterojunction solar cells

In this report we have discussed the need of conformal deposition of the low bandgap materials as absorber in solid-state bulk heterojunction devices. We demonstrated ALD grown Sb
₂
S
₃
and TiS
_x
thin films for photovoltaic applications. The deposition mechanism was studied in depth using in-situ quartz crystal microbalance (QCM). Need of modified reactor configuration for the uniform deposition of the material throughout the depth of the mesoporous host was discussed with elaborated comparative results for various absorber material device configurations.