Article
Chemistry, Physical
Shunya Yan, Alba Cazorla, Adara Babuji, Eduardo Solano, Christian Ruzie, Yves H. Geerts, Carmen Ocal, Esther Barrena
Summary: The identification of polymorphs in organic semiconductors is significant for establishing structure-property relationships and understanding microscopic charge transport physics. By using GIWAXS and AFM, the morphology and structure of C8O-BTBT-OC8 films were found to be affected by temperature, and the molecular arrangement at the interface has a direct impact on the performance of OFETs.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Anil Reddy Pininti, James M. Ball, Munirah D. Albaqami, Annamaria Petrozza, Mario Caironi
Summary: The study investigates the time-dependent electrical characteristics of field-effect transistors based on methylammonium lead iodide semiconductor and observes significant variations in output current, indicating hindered charge carrier mobility due to ion accumulation at grain boundaries. This research reveals the dynamic nature of field effect in solution-processed metal-halide perovskites and provides a methodology for characterizing charge carrier transport in emerging semiconductors.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Kanishka Kobbekaduwa, Exian Liu, Qian Zhao, Jasjit Singh Bains, Jianbing Zhang, Ying Shi, Haimei Zheng, Dawen Li, Tong Cai, Ou Chen, Apparao M. Rao, Matthew C. Beard, Joseph M. Luther, Jianbo Gao
Summary: We investigated the carrier drift dynamics in CsPbI3 nanocrystal thin films with a time resolution of sub 25 ps. The carriers exhibit band-like transport characteristics similar to traditional semiconductor solar absorbers (Si and GaAs) due to optical phonon and carrier scattering at high temperatures, prior to trapping. In contrast to popular polaron scattering mechanism, CsPbI3 nanocrystal thin film demonstrates the strongest optical phonon scattering mechanism among other inorganic-organic hybrid perovskites, Si, and GaAs. This ultrafast dynamics study provides a foundation for understanding the fundamental carrier drift properties in perovskite nanocrystal optoelectronics.
Article
Chemistry, Physical
Zhongguo Li, Zhendong Wu, Xiaolong Wang, Hongtao Cao, Lingyan Liang, Junyi Yang, Yinglin Song
Summary: The study demonstrates the fabrication of amorphous zinc tin oxide thin films with strong visible light absorption using rf magnetron sputtering and rapid postannealing. The ultrafast carrier dynamics of the ternary films were investigated using femtosecond transient absorption spectroscopy, revealing that visible light absorption is induced by band gap reduction rather than defect states in the ZTO film. These findings shed light on the photophysical mechanism of amorphous ZTO films and suggest their potential use in solar cell and photodetector devices.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Physics, Applied
WooJin Kim, Yuki Nishikawa, Yusuke Nakayama, Akihiko Fujii, Masanori Ozaki
Summary: The study explores the carrier transport characteristics of 1,4,8,11,15,18,22,25-octaalkylphthalocyanine (CnPcH(2)) thin films, revealing a decrease in estimated hole mobility as the alkyl chain length increases. The impact of alkyl chain length on the energetic width of hopping site and distribution of hopping distance is discussed.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2021)
Article
Multidisciplinary Sciences
Toshifumi Imajo, Takashi Suemasu, Kaoru Toko
Summary: This study investigates the strain effects on the crystal and electrical properties of polycrystalline Ge layers, finding that large strains promote large crystal grains and the direction of strain significantly affects the potential barrier height of the grain boundary. These findings will be valuable for designing Ge-based thin-film devices for Internet-of-Things technologies on various materials.
SCIENTIFIC REPORTS
(2021)
Article
Nanoscience & Nanotechnology
Ewa Malgorzata Nowik-Boltyk, Tobias Junghoefer, Mathias Glaser, Erika Giangrisostomi, Ruslan Ovsyannikov, Shuyang Zhang, Chan Shu, Andrzej Rajca, Arrigo Calzolari, M. Benedetta Casu
Summary: In this study, we investigate the degradation of radical thin films by comparing two Blatter radical derivatives. We find that the chemical and magnetic properties of the films are affected by interactions with different contaminants. Atomic H and NH2 negatively impact the magnetic properties of Blatter radicals, while molecular water specifically influences the magnetic properties of diradical thin films and contributes to their shorter lifetime in air.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Engineering, Electrical & Electronic
Philipp Riederer, Roland Kersting
Summary: Terahertz (THz) spectroscopy is a well-established tool for measuring high-frequency conductance of inorganic semiconductors, but its application to organic semiconductors is challenging. This paper presents the use of THz electromodulation spectroscopy for characterizing charge transport in organic semiconductors. The method allows for noise-free differential transmission and specific sensing of injected electrons or holes, providing access to fundamental transport properties that are difficult to obtain with conventional methods.
JOURNAL OF INFRARED MILLIMETER AND TERAHERTZ WAVES
(2023)
Article
Energy & Fuels
Rajrupa Paul, Vanessa Conti, Mahdi Zamani, Simon Escobar-Steinvall, Hector Sanchez-Martin, Carlotta Gastaldi, Mihai Adrian Ionescu, Ignacio Iniquez-de-la-Torre, Mirjana Dimitrievska, Anna Fontcuberta i Morral, Valerio Piazza
Summary: This study reports the electrical properties of Zn3P2 thin films with different crystallinity grown on InP substrates, and correlates the crystalline quality and composition to the electrical properties. Capacitance-voltage measurements and secondary ion mass spectroscopy demonstrate the direct correlation between the carrier concentration and the Zn/P ratio. The highest hole mobility value (125 cm2/Vs) was obtained from high-quality single crystalline Zn3P2 thin films. Additionally, the electrical characteristics of the heterojunction between the thin film and the substrate were illustrated. This work sheds light on the electrical properties and conduction mechanism, thus providing a better understanding of the limitations and potentials of the electrical devices related to the material.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2023)
Article
Chemistry, Multidisciplinary
Shuyu Cheng, M. Nrisimhamurty, Tong Zhou, Nuria Bagues, Wenyi Zhou, Alexander J. Bishop, Igor Lyalin, Chris Jozwiak, Aaron Bostwick, Eli Rotenberg, David W. McComb, Igor Zutic, Roland K. Kawakami
Summary: This article reports the band structure of epitaxial CoSn thin films grown on insulating substrates, and flat bands are observed using ARPES. The band structure is consistent with DFT calculations and the transport properties are quantitatively explained. This work paves the way for realizing flat band-induced phenomena through fine-tuning of flat bands in kagome materials.
Article
Chemistry, Physical
Snigdha Lal, Marcello Righetto, Aleksander M. Ulatowski, Silvia G. Motti, Zhuotong Sun, Judith L. MacManus-Driscoll, Robert L. Z. Hoye, Laura M. Herz
Summary: This study investigates the terahertz photoconductivity dynamics of thin films of BiOI and reveals a lack of self-trapping in charge carriers, leading to good charge-carrier mobility. The results show that BiOI has a higher potential as a light-harvesting semiconductor compared to traditional lead halide materials.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Fuming Wu, Yixuan Liu, Jun Zhang, Xiangxiang Li, Hui Yang, Wenping Hu
Summary: In this study, high-mobility stretchable semiconducting blend films were prepared by blending a polymer semiconductor with an elastomer. The resulting blend films have low crystallinity and high aggregation degree, resulting in high stretchability and high mobility. The fully stretchable organic transistors exhibit high hole maximum mobilities at various strains and show high mechanical robustness during repeated stretching-releasing cycles.
SCIENCE CHINA-MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
H. Akther, M. Mahbubur Rahman, A. H. Bhuiyan, Humayun Kabir, Sm Amir-Al Zumahi, J. A. Syed, Rahima Nasrin
Summary: In this study, PPTMA thin films were produced through plasma polymerisation process and evaluated using various characterisation techniques. The results showed that iodine-doped PPTMA films exhibited higher conductivity compared to the as-deposited ones.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Engineering, Electrical & Electronic
Kota Hanzawa, Hidenori Hiramatsu
Summary: LaWN3 epitaxial thin films were successfully grown on α-Al2O3 (0001) substrates using a multi-cathode RF magnetron sputtering gun system with metal targets and nitrogen gas. The films exhibited n-type degenerate semiconducting behaviors, an enlarged optical band gap, and superconductivity at 0.73 K. However, they did not show the predicted ferroelectric properties due to off-stoichiometry. Alternative growth processes are needed to decrease carrier density and achieve ferroelectricity.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Byeongsun Jun, Chi Ho Lee, Sang Uck Lee
Summary: In this study, we systematically investigated the strain-induced carrier mobility of two organic semiconductors and revealed their relationship with intermolecular packing configurations. The results showed periodic changes of the strain-induced carrier mobility, which can be attributed to the alternating phase changes of molecular orbital interactions. These findings are of significance for optimizing carrier mobility modulation and the development of organic electronic devices.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2022)
