Split-ligand re-precipitation via selective ligand capping for stable perovskite quantum dots in efficient photovoltaic application

Dong Hwan Wang; Jin Young Kim; MinSeong Kim; Byung Gi Kim; Woongsik Jang

doi:10.1117/12.2572290

20 August 2020 Split-ligand re-precipitation via selective ligand capping for stable perovskite quantum dots in efficient photovoltaic application

Dong Hwan Wang, Jin Young Kim, MinSeong Kim, Byung Gi Kim, Woongsik Jang

Author Affiliations +

Proceedings Volume 11471, Quantum Nanophotonic Materials, Devices, and Systems 2020; 1147111 (2020) https://doi.org/10.1117/12.2572290
Event: SPIE Nanoscience + Engineering, 2020, Online Only

Conference Poster

Abstract

Currently, perovskite containing organometal halides have issues for limited color range and low photoluminescence (PL). In this regard, we designed split-ligand mediated re-precipitation (Split-LMRP) as a unique synthesis method for improved stability and PL by separating octylamine and oleic acid (OA), compared to a conventional method. [Accepted manuscript] Octylamine adjusted the size of the nucleus as main ligand, while OA acted only as a stabilizer. Especially, the QDs based on Split-LMRP remained PL intensity after 5 days with strong PL emission and a high PL quantum yield (PLQY) of 91.5% due to the removal of most polar solvents during re-precipitation. In addition, the size of the QDs was adjusted constantly in the range of 2-5 nm depending on the concentration of octylamine. When the perovskite QDs were used as the intermediate layer of the perovskite solar cell, performance and reproducibility of the PSC were improved by forming stable phases.

Conference Presentation

Citation Download Citation

Dong Hwan Wang, Jin Young Kim, MinSeong Kim, Byung Gi Kim, and Woongsik Jang "Split-ligand re-precipitation via selective ligand capping for stable perovskite quantum dots in efficient photovoltaic application", Proc. SPIE 11471, Quantum Nanophotonic Materials, Devices, and Systems 2020, 1147111 (20 August 2020); https://doi.org/10.1117/12.2572290

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