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Eco-Friendly Photovoltaics Based on Stabilized AgBiS2 Nanocrystal Inks
Hyosung Choi(최효성) 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
We first report that long-chain ligands of AgBiS2 NCs are replaced with halometallate-based short ligands via solution-phase ligand exchange (SPLE). AgI and BiI3 are used as halometallate sources, and we find that colloidally stable, highly concentrated AgBiS2 NC inks in polar solvents are prepared via SPLE using AgI-based halometallates, enabling one-step deposition suitable for roll-to-roll process. This leads to higher degree of ligand exchange, sharper bandtail, lower trap density, and resultantly higher VOC in devices compared to conventional SSLE. We also first demonstrate that the photovoltaic performance can be improved by introducing ethanedithiol-exchanged AgBiS2 NCs on SPLE-prepared AgBiS2 NC solids because of favorable band alignment and extended depletion width. Thus, this enables improving device performance up to a power conversion efficiency of 4.08% with the highest VOC of 0.55 V among the AgBiS2 NC photovoltaics reported so far.
고효율 페로브스카이트 태양전지 광활성층을 위한 가압열처리 방법
이성범 ( Seongbeom Lee ),김단비 ( Danbi Kim ),정우현 ( Woo Hyeon Jeong ),양현석 ( Hyun-seock Yang ),이보람 ( Bo Ram Lee ),최효성 ( Hyosung Choi ),박성흠 ( Sung Heum Park ),손세모 ( Semo Son ) 한국화상학회 2021 한국화상학회지 Vol.27 No.1
Perovskite solar cells have been rapidly improved in device efficiency and are in the spotlight as a next-generation eco-friendly energy source. Achieving high-quality photo-active layer influenced by processing parameters is critical to the device performance of organic-inorganic hybrid perovskite solar cells. In this study, a pressure assisted annealing process (PA method) was developed to control the evaporation speed of the solvent inside perovskite layer. By applying pressure during the annealing process for crystallization of the methylammonium Lead Iodide (MAPbI<sub>3</sub>), we could control the evaporation speed of solvent to promote crystal growth of MAPbI<sub>3</sub> which enables to manufacture high-quality perovskite photo-active layers. As a result, the PA device exhibited a high PCE of ~17.3 % with significantly enhanced short-circuit current of ~24.4 mA cm<sup>-2</sup>, an open-circuit voltage of 0.96 V and a fill factor of 0.75.