Development of Solution Processable Fused-Thiophene Based Molecules for Optoelectronics(2/2)

Project Details

Description

Organic thin film transistors (OTFTs) have attracted intensive attention for potential applications in flexible displays, low-cost electronic papers. In recent years, my group has developed facile [X+1+Y] one-pot synthetic routes for fused thiophenes preparation, such as DTT (dithienothiophene), BTDT (benzothienodithiophene), TTA (tetrathienoacene), and PTA (pentathienothiophene). A few new fused-thiophene-based derivatives have been developed for OTFTs. For p-type materials development, we reported stable soluble BTDT-based materials with 0.65 cm2V-1s-1 mobility fabricated via a solution process. Recently, we have published two new soluble small molecules exhibited mobilities of 0.81 and 1.7 cm2V-1s-1, fabricated via a solution process. More recently, our new developed p-type small molecules have achieved high mobilities of 2.6 - 4.0 cm2V-1s-1. The later will be the Taiwan highest mobility small molecule via a solution process. For n-type materials development, we have developed a few new air-stable quinoidal molecules, for example, DTTQ exhibits ~0.45 cm2V-1s-1 mobility in air (AFM). Recently, we have developed two new soluble n-type small molecules exhibited mobilities of 0.77 and ~ 2.5 cm2V-1s-1, which will be the Taiwan highest n-type mobility small molecule via a solution process. Notably, these newly developed thiophene-based units are good building blocks and can be applied in OPV, 2PA, DSSC, and PSC. Our newly developed TTA-based chromophores exhibited high 2PA properties, up to 3000 GM, which is the highest performance of fused-thiophene-based 2PA chromophores. Our new developed TTA-based organic dyes exhibited PCE up to 11.2%, which also set a new highest record in Taiwan. Our new developed hole transporting layer (HTL) small molecules in Sn-based PSC (perovskite solar cell) exhibited 7.23 and 7.59 % PCE, both are one of the best HTLs for Sn-based PSC in the world. More recently, two of our new developed HTLs in Pb-based PSC exhibited 17.57 and 19.89 % PCE, hope the latter will be optimized to achieve a > 20% PCE very soon.Here in this project, we will continue modifying our newly-developed high-performance materials for their devices optimization and then published these good results. At the same time, new solution processable molecules will be developed for OTFT, OPV, and PSC. The optical/electronic performance of these new materials will be evaluated and optimized.
StatusFinished
Effective start/end date1/08/2131/07/22

UN Sustainable Development Goals

In 2015, UN member states agreed to 17 global Sustainable Development Goals (SDGs) to end poverty, protect the planet and ensure prosperity for all. This project contributes towards the following SDG(s):

  • SDG 2 - Zero Hunger
  • SDG 7 - Affordable and Clean Energy
  • SDG 17 - Partnerships for the Goals

Keywords

  • Organic thin film transistors (OTFTs)
  • [X+1+Y] one-pot
  • fused-thiophene
  • DTT (dithienothiophene)
  • TTA (tetrathienoacene)
  • organic dye
  • DSSC
  • OPV
  • 2PA
  • hole transporting layer (HTL)
  • PSC (perovskite solar cell)
  • PCE.

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