Enhanced performance in isoindigo based organic small molecule field-effect transistors through solvent additives

Abstract

We have investigated the field-effect transistor characteristics of a series of isoindigo based donor–acceptor–donor small molecules via solvent additives.

Solvent Additives: Key Morphology‐Directing Agents for Solution‐Processed Organic Solar Cells

“…Minute amounts of DIO (0.2% in CB) increased the number and size of crystalline grains for all four molecules studied, increasing mobilities. Similar concentrations of 1CN resulted in smaller grains and smoother morphology, useful for some derivatives . Enhanced mobility in OFET active layers can result from balancing overall crystallinity (promoted by poor solvents) with few grain boundaries (promoted by good solvents), which depend both on the interplay between the OSC material and the deposition solvent …”

Synthesis and characterizations of carbazole–isoindigo–carbazole oligomers for photovoltaic application

“…When the ratio of C-II-C to PC 71 BM increased from 1:1 to 1:4, the V oc values were only slightly changed, but the J sc values increased significantly from 0.50 to 2.14 mA/cm 2 , and the PCE of the devices increased from 0.06% to 0.38%. It has been well-known that additives such as 1,8-diiodooctane (DIO) and 1-chloronaphthalene (CN) can improve the morphology of photoactive layers such that charge transport and phase separation can be more facilitated, leading to an increase of PCE [29,30]. Thus, we attempted to further improve the best device performances of C-II-C/PC 71 BM (1/4), using such additives, and the results are shown in Fig.…”

Influence of pH-neutral lithium polystyrenesulfonate polyelectrolyte on the energy band structure and performance of organic solar cells

“…All of the films showed relatively amorphous surface morphologies with no prominent structural features. The very thin Li:PSS films and Li:PSS A4 films have a surface structure similar to ITO itself 40 . The root mean square (RMS) of surface roughness of all the films was in the range of 0.72 to 1.76 nm, which may be considered smooth enough for use as an HTL in solar cell devices.…”