Tham khảo tài liệu 'solar cells new aspects and solutions part 14', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 446 Solar Cells - New Aspects and Solutions with P63-64 PC71BM 1 3 w w showed a PCE of for P63 and for P64 higher than that of the device based on P3HT PC71BM 1 1 w w under the same conditions. 5. Conclusions Narrow band gap polymers P1-P64 developed by alternating donor ca. fluorene carbazole and thiophene and acceptor quinoxaline and diketopyrrolopyrrole units in recent 4 years are summarized with their fullerene blend-based BHJ OSCs contributing PCE over 3 . The design criteria for ideal polymer donors to achieve high efficiency OSCs is 1 a narrow Eg with broad absorption to match solar spectrum 2 a HOMO energy level ranging from to eV and a LUMO level ranging from to to ensure efficient charge separation while maximizing Voc and 3 good hole mobility to allow adequate charge transport. Besides device structure and morphology optimizations of polymer fullerene blend film have been extensively demonstrated to be crucial for PCE improvement in OSCs. The current endeavors boosted OSCs PCEs up to 7 would encourage further efforts toward a next target of efficiency in excess of 10 . 6. References Allard N. Aich RB. Gendron D. Boudreault P-LT. Tessier C. Alem S. Tse S-C. Tao Y. Leclerc M. 2010 . Germafluorenes new heterocycles for plastic electronics. Macromolecules Vol. 43 No. 5 January 2010 pp. 2328-2333 IsSn 1520-5835 Ameri T. Dennler G. Lungenschmied C. Brabec CJ. 2009 . Organic tandem solar cells a review. Energ. Environ. Sci. Vol. 2 No. 4 February 2009 pp. 347-363 ISSN 17545692 Beal RM. Stavrinadis A. Warner JH. Smith JM. Beal HE. 2010 . The molecular structure of polymer-fullerene composite solar cells and its influence on device performance. Macromolecules Vol. 43 No. 5 February 2010 pp. 2343-2348 ISSN 1520-5835 Blouin N Michaud A. Leclerc M. 2007 . A low-bandgap poly 2 7-Carbazole derivative for use in high-performance solar cells. Adv. Mater. September 2007 pp. 2295-2300 ISSN .
