Centre for Advanced Materials for Integrated Energy Systems (CAM-IES)
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1 Centre for Advanced Materials for Integrated Energy Systems (CAM-IES) Kick Off meeting January 2017 WP4 -inorganic hybrid interfaces - Spin. WP4 Leader: Hugo Bronstein - UCL
2 Members UCL Bronstein WP Leader, Synthesis Cacialli Devices, photophysics Clarke - Spectroscopy Papakonstantinou - Characterization CAM Friend Spectroscopy, Devices Greenham Spectroscopy, Nanocrystals Rao Spectroscopy, Devices QMUL Nielsen - Synthesis Gillin Characterization, Spin NCU Gibson Photo/electro chemistry Penfold Simulation, Theory Cucinotta Supramolecular chemistry
3 AIM: Increase the efficiency of inorganic through the use of Singlet Fission
4 1. Light Absorption
5 2. Singlet Formation
6 3. Singlet Fission
7 4. Triplet Diffusion
8 4. Triplet Diffusion
9 4. Triplet Diffusion
10 4. Triplet Diffusion
11 5. Triplet Injection
12 Photocurrent 6. Photocurrent Generation
13 Light Absorption/Singlet Fission Singlet Fission has very strict energetic requirements Brian J. Walker, Andrew J. Musser,David Beljonne, Richard H. Friend, Nature Chemistry 5, (2013) Linear acenes (tetracene, pentacene) almost exclusively used Suffer from poor stability and lack of tunability (limits choice of inorganic component) TASK: Develop stable, tunable materials for singlet fission (UCL-CAM)
14 4. Triplet Diffusion Triplet diffusion in organic materials is not well understood. Large range of values ranging from ~ 0 (immobile) to 2 microns. Triplet exciton diffusion in pentacene (a singlet fission material) found to be 40 nm. Maxim Tabachnyk, Bruno Ehrler, Sam Bayliss, Richard H. Friend, and Neil C. Greenham, Applied Physics Letters :15 TASK: Develop understanding of triplet diffusion in organic materials (i.e diffusion anisotropy, effect of morphology, exciton confinement etc..) (UCL)
15 5. Triplet Injection Direct injection of triplet excitons into an inorganic semiconductor has only recently been demonstrated from pentacene to PbSe Efficient transfer seems to require resonance (±0.2 ev) of the triplet energy with the bandgap of the inorganic semiconductor. Effect of molecular orientation, distance, interlayers and energetics almost completely unexplored Maxim Tabachnyk, Bruno Ehrler, Simon Gélinas, Marcus L. Böhm, Brian J. Walker, Kevin P. Musselman, Neil C. Greenham, Richard H. Friend, Akshay Rao, Nature Materials 13, (2014) TASK: Develop an understanding the nature of the interface between organic and inorganic semiconductors with an aim to increasing triplet injection (CAM)
16 6. Choice of Semiconductor/Photocurrent Generation Perovskite solar cells are of comparable efficiency to Silicon, and there are numerous other potential inorganic materials (eg ZnO, PbSe etc..). Each have their benefits and drawbacks. Important to understand the generality of the inorganic-organic interface with different semiconductors. Also, possibility of chemical modification of some of these to directly link organic-inorganic components TASK: Determine optimum inorganic materials for interface. Explore the possibility of surface modifications/functionalisation. (CAM)
17 Looking Forward to It!
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