Development of a novel isotype organic heterojunction diode consisting of poly{7-spiro(9-fluorenyl)cyclopentadithiophene} and poly(3-octylthiophene)

Stabilization of Charge Carriers in Picket‐Fence Polythiophenes Using Dielectric Side Chains

“…The main framework of the monomer, 7‐spiro(9‐fluorenyl)‐cyclopentadithiophene (SFT), was reported by Bäuerle and coworkers in 2001 as a building block of oligothiophenes for electrogenerated chemiluminescence applications, but its polymerization was not attempted. Later, Ng and co‐workers electrochemically synthesized a poly(SFT) film to fabricate a heterojunction diode. However, as is often problematic with such insoluble polymeric materials, thorough characterization of the polymer was not performed.…”

4,4′‐Spirobi[cyclopenta[2,1‐b;3,4‐b′]dithiophene: A New Generation of Heterocyclic Spiro‐Type Molecules

“…Considerable works have been done in order to replace the phenyl units of the core unit with less aromatic heteroaryl units such as thiophene. However, these efforts were only partially successful, resulting for example in a core unit with mixed chromophores between a bifluorene and a bithienyl unit [19,20] or a phenyl-thiophenyl and a bifluorene unit [21][22][23] or in a thiophene based core unit with a silicon atom at the centre of the spiro core. [24] In this paper we report for the first time on a new spiro type molecule with only thiophene as a central aromatic system with a spiro carbon atom, giving the core unit 4,4′-spirobi[cyclopenta[2,1-b;3,4-b′]dithiophene] (Spiro-CPDT).…”

In-situ tunable pP heterojunction based on organic conducting polymers

“…This approach actually eliminates even need of one p and one n type semiconductor for rectifying heterojunction. Hence a rectifying heterojunction using two p type organic semiconductor or two n type organic semiconductors has been demonstrated [14][15][16]. These junctions are called isotype heterojunction.…”