I'm quite interested in this but I'm concerned that it will be really expensive. Do you also cater to research papers, probably in related literature part. In relation to renewable energy sources with photovoltaic devices. Something related to that.
I am always accepting what my student can pay. I'm a physics tutor at 24houranswers (this is what I am doing daily since 3 years now), you can find me here
https://www.24houranswers.com/tutors/profile/titel68
or you can ask me here in the bitcointalk forum your questions (or translations).
I also do reasearch papers, especially in renewable energy sources (photovoltaic devices).
You can find one paper here
http://www.show-my-homework.com/2016/04/solar-cells.html
http://www.show-my-homework.com/2016/04/physics-of-solar-cells.html
