Comments? I just changed the comment settings: up to now, a WordPress account was needed in order to be able to comment on my posts. Believe me or not, I did not even know about this setting till today. Now, you only have to give your (or some;-) name and an email address (yours? I do not know). Maybe this lowers the barrier for some of you to ask questions or provide further insights and critical views.

Tomorrow is abstract deadline for the SPIE Optics and Photonics 2011, including the session Organic Photovoltaics XII. See you there:-)

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4 thoughts on “Comments”

  1. Have you considered putting up a discussion forum? The one at is a good example of a forum where some very technical and interesting scientific conversations appear on a regular basis, unprovoked by the blog’s founder. I think it could draw more visitors to yours.

  2. Hello Sir

    i am graduate student and new to this field. It would be great if you could find some time for giving an insight into the capacitance vs Voltage behavior of Organic bulk Hetero junction Solar Cell eg. P3HT:PCBM). I have a low frequency CV data ( @ 100Hz) from -1.0 Volt to +0.5 volt. But I am confused how to interpret it. How to calculate Built In potential and total defect states in P3HT. what is the physics behind it. Is there any concept of Depletion width in Bulk hetero junction? How can we get a complete picture of Built in voltage and depletion width in organic bulk hetero junction.

    Waiting for your response.



    1. Dear Joydeep, answering questions on C-V takes more time than I have;-) Low frequency is a good idea in any case. Concerning Mott-Schottky evaluation, the prerequisites are quite different as compared to a bulk heterojunction solar cell. From our group, some thoughts on the determination of the quasi flatband voltage (not built-in potential!) are in [Limpinsel 2010], including experiment and simulations. Interesting to you may be [von Mensfoort 2008]. Concerning doping determination by Mott-Schottky evaluation, I personally do not trust it. Thus, the question is: what information do you want to get, and which technique is (better) suited for the task. Good luck, Carsten

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