1 research outputs found
Qualitative Analysis of Bulk-Heterojunction Solar Cells without Device Fabrication: An Elegant and Contactless Method
The enormous synthetic
efforts on novel solar cell materials require
a reliable and fast technique for the rapid screening of novel donor/acceptor
combinations in order to quickly and reliably estimate their optimized
parameters. Here, we report the applicability of such a versatile
and fast evaluation technique for bulk heterojunction (BHJ) organic
photovoltaics (OPV) by utilizing a steady-state photoluminescence
(PL) method confirmed by electroluminescence (EL) measurements. A
strong relation has been observed between the residual singlet emission
and the charge transfer state emission in the blend. Using this relation,
a figure of merit (FOM) is defined from photoluminescence and also
electroluminescence measurements for qualitative analysis and shown
to precisely anticipate the optimized blend parameters of bulk heterojunction
films. Photoluminescence allows contactless evaluation of the photoactive
layer and can be used to predict the optimized conditions for the
best polymer–fullerene combination. Most interestingly, the
contactless, PL-based FOM method has the potential to be integrated
as a fast and reliable inline tool for quality control and material
optimization