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Additive-Assisted Control over Phase-Separated Nanostructures by Manipulating Alkylthienyl Position at Donor Backbone for Solution-Processed Non-Fullerene All-Small-Molecule Solar Cells.
MedLine Citation:
PMID:  24559327     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
A non-fullerene all small molecule solar cell (NF-SMSC) device uses the blend of a small molecule donor and a small molecule acceptor as the active layer. Aggregation ability is a key factor for this type of solar cell. Herein, we used the alkylthienyl unit to tune the aggregation ability of the diketopyrrolopyrrole (DPP)-based small molecule donors. Replacing two alkoxyl units in BDT-O-DPP with two alkylthienyl units yields BDT-T-DPP, and further introducing another two alkylthienyl units into the backbone produces BDT-T-2T-DPP. With the introduction of alkylthienyl, the backbone becomes twisted. As a result, the ππ-stacking strength, aggregation ability, and the crystallite size all obey the sequence of BDT-O-DPP > BDT-T-DPP > BDT-T-2T-DPP. When selected a reported perylene diimide dimer of Bis-PDI-T-EG as acceptor, the best NF-SMSC device exhibits a power conversion efficiency of 1.34%, 2.01%, and 1.62%, respectively, for the BDT-O-DPP, BDT-T-DPP, and BDT-T-2T-DPP based system. The BDT-T-DPP/Bis-PDI-T-EG system yields the best efficiency of 2.01% among the three combinations. This is due to the moderate aggregation ability of BDT-T-DPP yields moderate phase size of 30-50 nm, whereas the strong aggregation ability of BDT-O-DPP gives a bigger size of 50-80 nm and the weak aggregation ability of BDT-T-2T-DPP produces a smaller size of 10-30 nm. The BDT-T-DPP/Bis-PDI-T-EG combination exhibits balanced hole/electron mobility of 0.022/0.016 cm(2)/V•s, whereas the BDT-O-DPP/Bis-PDI-T-EG and the BDT-T-2T-DPP/Bis-PDI-T-EG blend show a hole/electron mobility of 0.0011/0.0057 cm(2)/V•s and 0.0016/0.11 cm(2)/V•s, respectively.
Authors:
Jianhua Huang; Xue Wang; Xin Zhang; Zhixiao Niu; Zhenhuan Lu; Bo Jiang; Yuxi Sun; Chuanlang Zhan; Jiannian Yao
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-2-21
Journal Detail:
Title:  ACS applied materials & interfaces     Volume:  -     ISSN:  1944-8252     ISO Abbreviation:  ACS Appl Mater Interfaces     Publication Date:  2014 Feb 
Date Detail:
Created Date:  2014-2-24     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101504991     Medline TA:  ACS Appl Mater Interfaces     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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