TY  - JOUR
A1  - Xu, Jingsan
A1  - Cao, Shaowen
A1  - Brenner, Thomas J. K.
A1  - Yang, Xiaofei
A1  - Yu, Jiaguo
A1  - Antonietti, Markus
A1  - Shalom, Menny
T1  - Supramolecular Chemistry in Molten Sulfur: Preorganization Effects Leading to Marked Enhancement of Carbon Nitride Photoelectrochemistry
JF  - Advanced functional materials
N2  - Here, a new method for enhancing the photoelectrochemical properties of carbon nitride thin films by in situ supramolecular-driven preorganization of phenyl-contained monomers in molten sulfur is reported. A detailed analysis of the chemical and photophysical properties suggests that the molten sulfur can texture the growth and induce more effective integration of phenyl groups into the carbon nitride electrodes, resulting in extended light absorption alongside with improved conductivity and better charge transfer. Furthermore, photophysical measurements indicate the formation of sub-bands in the optical bandgap which is beneficial for exciton splitting. Moreover, the new bands can mediate hole transfer to the electrolyte, thus improving the photooxidation activity. The utilization of high temperature solvent as the polymerization medium opens new opportunities for the significant improvement of carbon nitride films toward an efficient photoactive material for various applications.
KW  - carbon nitride thin film
KW  - charge transfer
KW  - molten sulfur
KW  - photoelectrochemistry
Y1  - 2015
U6  - https://doi.org/10.1002/adfm.201502843
SN  - 1616-301X
SN  - 1616-3028
VL  - 25
IS  - 39
SP  - 6265
EP  - 6271
PB  - Wiley-VCH
CY  - Weinheim
ER  - 
TY  - JOUR
A1  - Ghani, Fatemeh
A1  - Opitz, Andreas
A1  - Pingel, Patrick
A1  - Heimel, Georg
A1  - Salzmann, Ingo
A1  - Frisch, Johannes
A1  - Neher, Dieter
A1  - Tsami, Argiri
A1  - Scherf, Ullrich
A1  - Koch, Norbert
T1  - Charge Transfer in and Conductivity of Molecularly Doped Thiophene-Based Copolymers
JF  - Journal of polymer science : B, Polymer physics
N2  - The electrical conductivity of organic semiconductors can be enhanced by orders of magnitude via doping with strong molecular electron acceptors or donors. Ground-state integer charge transfer and charge-transfer complex formation between organic semiconductors and molecular dopants have been suggested as the microscopic mechanisms causing these profound changes in electrical materials properties. Here, we study charge-transfer interactions between the common molecular p-dopant 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane and a systematic series of thiophene-based copolymers by a combination of spectroscopic techniques and electrical measurements. Subtle variations in chemical structure are seen to significantly impact the nature of the charge-transfer species and the efficiency of the doping process, underlining the need for a more detailed understanding of the microscopic doping mechanism in organic semiconductors to reliably guide targeted chemical design.
KW  - charge transfer
KW  - conducting polymers
KW  - doping
KW  - thiophene
Y1  - 2015
U6  - https://doi.org/10.1002/polb.23631
SN  - 0887-6266
SN  - 1099-0488
VL  - 53
IS  - 1
SP  - 58
EP  - 63
PB  - Wiley-Blackwell
CY  - Hoboken
ER  -