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14. Profitability and herding of trade-based pump-and-dump manipulation.

Author

Lee, Eun Jung, Lee, Yu Kyung, and Kim, Ryumi

Subjects
INVESTORS, HERDING, PROFITABILITY, EMERGING markets, TRANSACTION costs, STOCKS (Finance)
Abstract

We use the Korea Stock Exchange's complete intraday order and trade data in a dataset that identifies individual accounts to examine whether trade-based pump-and-dump manipulators can trade profitably and whether other investors herd after the manipulation. The results show that other investors place more buy orders on stocks with higher manipulative buying volume and that more new investors buy such stocks. We also find that the trade-based pump-and-dump manipulation is profitable on average, both gross and net of transaction costs. Manipulators who have higher trading volume, more experience with manipulation, and less frequent transactions are likely to achieve larger profits. We also find that this type of manipulation is far more pervasive in the emerging market. [ABSTRACT FROM AUTHOR]

Published
2024
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15. Enhancement of Interfacial Properties by Indoloquinoxaline‐Based Small Molecules for Highly Efficient Wide‐Bandgap Perovskite Solar Cells.

Author

Yong, Jihye, Lee, Yu Kyung, Park, Hansol, Muthu, Senthilkumar, Shin, Juhwan, Whang, Dong Ryeol, Kim, Bong‐Gi, Chang, Dong Wook, and Park, Hui Joon

Subjects
*SOLAR cells, *HYBRID solar cells, *TRIPHENYLAMINE, *SMALL molecules, *PEROVSKITE
Abstract

Interfacial engineering in organic–inorganic hybrid perovskite solar cells (PSCs) has attracted significant attention, aiming to achieve high‐performing and highly stable devices. Here, newly designed organic small molecules based on quinoxaline and triphenylamine for inverted type wide‐bandgap PSCs are introduced, with the objective of enhancing the interfacial properties between perovskite and NiOx hole transport layer (HTL). The incorporation of an organic interlayer effectively reduces the energy level offset between the HTL and wide‐bandgap perovskite, while passivating defects within the perovskite layer. It leads to improved charge extraction and minimized non‐radiative recombination at the interface. Furthermore, the enhanced interfacial characteristics and hydrophobicity contribute to the improvement of perovskite film quality, resulting in larger grain size and higher crystallinity. As a result, the power conversion efficiency (PCE) of the PSC is enhanced from 18.9% to 20.1% with the incorporation of the IQTPAFlu interlayer, accompanied by an increase in Voc to ≈1.3 V, achieving a significantly low Voc deficit of 0.46 V. And the IQTPAFlu‐based devices demonstrate stable and consistent performance over 500 h, with ≈91% of their initial PCE retained. The highly stable wide‐bandgap PSCs, characterized by high Voc and PCEs, hold great promise as potential candidates for tandem solar cells. [ABSTRACT FROM AUTHOR]

Published
2024
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