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Title of article :
Solution-processed bulk heterojunction organic solar cells with high polarity small molecule sensitizer
Author/Authors :
Choi، نويسنده , , Jin Woo and Kulshreshtha، نويسنده , , Chandramouli and Kennedy، نويسنده , , G.P. and Kwon، نويسنده , , Jang Hyuk and Jung، نويسنده , , Sung-Hyun and Chae، نويسنده , , Miyoung، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2011
Pages :
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Abstract :
A new sensitizer molecule, HMBI (9,18-(di-2-hexyldecyl)-2,11-dimethoxy-9,18-dihydrobenzo[5,6]-s-indaceno[1,2-b]indeno[2,1-h]carbazol-6,15-dione), containing electron-donating carbazole and electron-accepting diketone units, has been synthesized for solution-processed bulk heterojunction organic solar cells. The HMBI material has good solubility in common organic solvents. Its HOMO and LUMO energy levels were found to be at 5.6 and 3.0 eV, respectively. It has absorption bands ranging from 300 to 500 nm. Dispersion of HMBI molecules in the P3HT/PCBM blend broadens the absorption bands over the spectral range of 350–500 nm. Uniform thin film devices doped with varying concentration of HMBI, incorporated within the P3HT/PCBM blend, were fabricated. The 3 wt% of HMBI doping produces an improvement in power-conversion efficiency (PCE) up to 11.5% compared with the reference P3HT/PCBM device. Efficient light harvesting caused by HMBI sensitizer molecules primarily yields increased carrier generation and short-circuit current. In addition, some morphological improvements in the P3HT/PCBM system may contribute to the generation of enhanced photocurrent.
Keywords :
Bulk heterojunction , solar cells , energy transfer , Doping , Sensitizer
Journal title :
Solar Energy Materials and Solar Cells
Journal title :
Solar Energy Materials and Solar Cells
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