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	Improved Performance for Inverted Organic Photovoltaics via Spacer between Benzodithiophene and Benzothiazole in Polymers
	Mohammad, Lal1; Chen, Qilang1; Abu Mitul1; Sun, Jianyuan2; Khatiwada, Devendra1; Vaagensmith, Bjorn1; Zhang, Cheng2; Li, Jing3; Qiao, Qiquan1
	2015-08-20
摘要	In this work, the effects of the spacer between benzo[1,2-b;3,4-b']dithiophene (BDT) and dialkoxybenzothiadiazole (ROBT) in polymers were investigated for applications in organic solar cells. Polymer PBDT-2T-ROBT has a bithiophene (2T) spacer between the BDT and ROBT units, whereas PBDT-ROBT is a direct copolymer of BDT and ROBT. The polymer/PC70BM solar cells using both polymers were fabricated and optimized via polymer/fullerene ratio, solvent, and solvent additives. The spacer has significantly improved solar cell performance from 1.28% (V-oc =0.77 V, J(sc) = 3.13 mA/cm(2), FF = 53.11%) to 5.11% (V-oc = 0.66 V, J(sc) = 13.33 mA/cm(2), FF = 58.12%). The X-ray diffraction (XRD) spectra show the PBDT-2T-ROBT/PC70BM blended film is semicrystalline, whereas the PBDT-ROBT/PC70BM film is amorphous. This indicates that the spacer facilitates polymer organization for higher carrier mobility in the film Atomic force microscopy (AFM) topography and phase images show that PBDT-2T-ROBT/PC70BM films form fibrillar networks, whereas PBDT-ROBT/PC70BM films exhibit larger granular morphology. The photoinduced charge extraction by linearly increasing voltage (Photo-CELIV) measurements show that PBDT-2T-ROBT/PC70BM has a mobility-of 9.59 x 10(-5) cm(2)/(V.s), which is higher than the mobility of 8.64 x 10(-5) cm(2)/(V.s) for PBDT ROBT/PC70BM film.
DOI	10.1021/acs.jpcc.5b05608
发表期刊	JOURNAL OF PHYSICAL CHEMISTRY C
ISSN	1932-7447
卷号	119期号:33页码:18992-19000
通讯作者	Zhang, C (reprint author), S Dakota State Univ, Dept Chem & Biochem, Brookings, SD 57007 USA.
收录类别	SCI
WOS记录号	WOS:000360026200019
语种	英语