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SUMMARY:Do reduced aggregation and crystallinity really help to improve th
 e photovoltaic performance of terpolymer acceptors in all-polymer solar ce
 lls?
DTSTART;VALUE=DATE-TIME:20211125T075600Z
DTEND;VALUE=DATE-TIME:20211125T075700Z
DTSTAMP;VALUE=DATE-TIME:20260306T085558Z
UID:indico-contribution-4369@events01.synchrotron.org.au
DESCRIPTION:Speakers: Doan Vu (Monash University)\nTerpolymerization is a 
 widely used method to control crystallinity of the semiconducting polymers
  which has been exploited to improve the photovoltaic performance of all-p
 olymer solar cells (all-PSCs). Applying this strategy to the well-studied 
 n-type polymer acceptor PNDI2OD-T2\, different amounts of 3-n-octylthiophe
 ne (OT) are used to partially replace the bithiophene (T2) unit\, resultin
 g in three newly-synthesized terpolymer acceptors PNDI-OTx where x = 5%\, 
 10%\, or 15%. Another copolymer\, namely PNDI2OD-C8T2\, consisting of naph
 thalene diimide (NDI) copolymerised with 3-n-octylbithiophene (C8T2) is al
 so synthesized for comparison. The experimental X-ray characterizations su
 ggest that the molecular orientation of π-conjugated backbone in PNDI-OTx
  is slightly impacted and thin film crystallinity is systematically tuned 
 by varying x\, evidenced by near edge X-ray absorption fine structure (NEX
 AFS) and grazing incidence wide angle X-ray scattering (GIWAXS) measuremen
 ts\, respectively. However\, the photovoltaic performance of all-PSCs base
 d on J71:PNDI-OTx and J71:PNDI2OD-C8T2 blends are much lower than that of 
 the reference J71:PNDI2OD-T2 system. Extensive morphological studies sugge
 st that reduced crystallinity is likely to have a little influence on vert
 ical phase separation and crystallinity of resulting blends as revealed by
  peak fits from NEXAFS and GIWAXS experiments. However\, the reduced cryst
 allinity is detrimental for morphology of the blend films\, with coarser p
 hase separation found in J71:PNDI-OTx and J71:PNDI2OD-C8T2 blends compared
  to J71:PNDI2OD-T2 blends\, confirmed by resonant soft X-ray scattering. T
 he results here challenge the common view that reduced crystallinity is th
 e key parameter in controlling the morphology for enabling high-performing
  all-PSCs.\n\nhttps://events01.synchrotron.org.au/event/146/contributions/
 4369/
LOCATION:Online
URL:https://events01.synchrotron.org.au/event/146/contributions/4369/
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