I opened a thread last year on tio2 use , it has ultrawide spectrum and even with coating with dyes increases the end power of solar cell. I dont think a printed on film solar cell maker wants to invent and use a expensive dye , so the widest available dye would be the selection with some drawbacks.
My intention is to use titanium dioxide in the place of silver. If I remember correctly , a reducing agent was needed and final decision was it would cost more than buying silver. Its silly but without forum support , I dont lots of options.
You can dig it now and if you can.
By the way , I saw rhodamine , it doesnt work if you dont freeze it. Alizarin dyes are cheap and widely available and I am right , they want to make the lowest cost device.