Revealing the Effect of Additives with Different Solubility on the Morphology and the Donor Crystalline Structures of Organic Solar Cells

Jiao Zhao; Suling Zhao; Zheng Xu; Bo Qiao; Di Huang; Ling Zhao; Yang Li; Youqin Zhu; Peng Wang

doi:10.1021/acsami.6b02671

Revealing the Effect of Additives with Different Solubility on the Morphology and the Donor Crystalline Structures of Organic Solar Cells

ACS Appl Mater Interfaces. 2016 Jul 20;8(28):18231-7. doi: 10.1021/acsami.6b02671. Epub 2016 Jul 6.

Authors

Jiao Zhao^{1

2}, Suling Zhao^{1

2}, Zheng Xu^{1

2}, Bo Qiao^{1

2}, Di Huang^{1

2}, Ling Zhao^{1

2}, Yang Li^{1

2}, Youqin Zhu^{1

2}, Peng Wang^{1

2}

Affiliations

¹ Key Laboratory of Luminescence and Optical Information (Beijing Jiaotong University), Ministry of Education , Beijing 100044, China.
² Institute of Optoelectronics Technology, Beijing Jiaotong University , Beijing 100044, China.

PMID: 27328855
DOI: 10.1021/acsami.6b02671

Abstract

The impact of two kinds of additives, such as 1,8-octanedithiol (ODT), 1,8-diiodooctane (DIO), diphenylether (DPE), and 1-chloronaphthalene (CN), on the performance of poly[(5,6-difluoro-2,1,3-benzothiadiazol-4,7-diyl)-alt-(3,3‴-di(2-octyldodecyl)2,2';5',2″;5″,2‴-quaterthiophen-5,5‴-diyl)] (PffBT4T-2OD):[6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) based polymer solar cell are investigated. The polymer solar cells (PSCs) of PffBT4T-2OD:PC71BM by using CN show a more improved PCE of 10.23%. The solubility difference of PffBT4T-2OD in DIO and CN creates the fine transformation in phase separation and favorable nanoscale morphology. Grazing incidence X-ray diffraction (GIXRD) data clearly shows molecular stacking and orientation of the active layer. Interestingly, DIO and CN have different functions on the effect of the molecular orientation. These interesting studies provide important guidance to optimize and control complicated molecular orientations and nanoscale morphology of PffBT4T-2OD based thick films for the application in PSCs.

Keywords: high efficiency; molecular orientation effect; morphology; polymer solar cell; solution additive.