Proceedings of Online nanoGe Fall Meeting 20 (OnlineNFM20)
Publication date: 4th October 2020
The strength of electron-hole-pair Coulomb interactions in organic and two-dimensional (2D) semiconductors strongly affects the performance of such excitonic materials in optoelectronic devices. An important target for these materials is the tuning of the exciton binding energy independent of the electronic band gap. By incorporating donor-acceptor interactions into the organic sublattice of a layered lead iodide perovskite, we observe a reduction in exciton binding energy of almost 50%, due to enhanced electrostatic screening of the exciton with greater polarizability in the organic lattice. We present temperature dependent absorption and photoluminescence measurements to investigate the optical effects of this structural modification. The synthetic strategy developed here for 2D hybrid layered perovskites enables highly modular tuning of exciton binding energies with negligible modification of the inorganic structure.The strength of electron-hole-pair Coulomb interactions in organic and two-dimensional (2D) semiconductors strongly affects the performance of such excitonic materials in optoelectronic devices. An important target for these materials is the tuning of the exciton binding energy independent of the electronic band gap. By incorporating donor-acceptor interactions into the organic sublattice of a layered lead iodide perovskite, we observe a reduction in exciton binding energy of almost 50%, due to enhanced electrostatic screening of the exciton with greater polarizability in the organic lattice. We present temperature dependent absorption and photoluminescence measurements to investigate the optical effects of this structural modification. The synthetic strategy developed here for 2D hybrid layered perovskites enables highly modular tuning of exciton binding energies with negligible modification of the inorganic structure.
** This is a resubmission of my abstract, as "Contributed Talk" was not an active option on the submission menu, when I initially registered, but I intended to submit as a contributed talk. Thank you, and apologies for the confusion! **
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