I want to write an article on OPV I am trying to find gaps in papers but I spent time on it now I am completely hopeless is there anyone who can give me the right directions or suggest me new idea on which I can work
Thanks in advance
Dear Iqrar Hussain
I presume that you are referring to the band gap of the materials? The first thing to consider is that typically most OPVs will consist of a blend of donor and acceptor materials. Each of these compounds will have its own band gap. Common approaches to determine this band gap are based on absorption spectroscopy or sometimes also on the external quantum efficiency. However, in general the band gaps are not as sharply defined in organic semiconductors compared to their inorganic counterparts. Further complications arise from the fact that the absolute energy levels of the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) - which are roughly equivalent to the valence and conduction band in inorganic semiconductors - can vary widely depending on the technique used to determine them (i.e. electrochemical techniques vs. XPS).
A good overview of materials can be found here: Article The Energy Level Conundrum of Organic Semiconductors in Solar Cells
.I hope this helps.
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