Solution-Processed Polymer-Free Photovoltaic Devices Consisting Of Pbse Colloidal Quantum Dots And Tetrabenzoporphyrins.pdf

APPLIED PHYSICS LETTERS 92, 173307 ͑2008͒
Solution-processed polymer-free photovoltaic devices consisting of PbSe
colloidal quantum dots and tetrabenzoporphyrins
͒
Einosuke Kikuchi,1 Seiki Kitada,1 Akira Ohno,2 Shinji Aramaki,2 and Shinya Maenosono1,a
1Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan
2Mitsubishi Chemical Group Science and Technology Research Center, Inc., 1000 Kamoshida-cho, Aoba-ku,
Yokohama 227-8502, Japan
͑Received 6 February 2008; accepted 14 April 2008; published online 2 May 2008͒
Polymer-free photovoltaic devices were fabricated via a solution process using PbSe colloidal
quantum dots and anic semiconductor, tetrabenzoporphyrin, that can be derived from a
soluble precursor. Flat heterojunction ͑FHJ͒ and bulk heterojunction ͑BHJ͒ devices were fabricated
and the current-voltage characteristics of the devices were measured. Consequently, we observed
photovoltaic conversion for both devices and found the energy conversion efficiency of the BHJ
device −3%͒ is 40 times that of the FHJ device under 100 mW cm−2 illumination at
800 nm. © 2008 American Institute of Physics. ͓DOI:
Organic photovoltaic cells ͑OPVCs͒ are expected to be In this letter, we demonstrate the idea that the high ␮ of
next-generation solar energy conversion devices because BP cm2 V−1