Xiaolong Liu

Academy Research Fellow

Data Agent of the School of Electrical Engineering (ELEC)

Full researcher profile

https://research.aalto.fi/...

[email protected]

Areas of expertise

Atomic layer deposition, Data management, Femtosecond laser, Germanium, Hyperdoping, Optoelectronics, Sensors, Silicon, Surface passivation, Surface texturing

Honors and awards

Optica reviewer certificate

Optica reviewer certificate: For dedication to quality scientific peer review and for completing two or more scientific paper reviews in 2023.

Award or honor granted for a specific work Department of Electronics and Nanoengineering Jan 2024

Optica reviewer certificate

Optica reviewer certificate: For dedication to quality scientific peer review and for completing two or more scientific paper reviews in 2022.

Award or honor granted for a specific work Department of Electronics and Nanoengineering Jan 2023

Academy Research Fellowship

Granted funding (personal grants) Department of Electronics and Nanoengineering May 2023

Research groups

Hele Savin Group, Academy Research Fellow

Publications

Wetting Properties of Black Silicon Layers Fabricated by Different Techniques

Gagik Ayvazyan, Levon Hakhoyan, Arman Vardanyan, Hele Savin, Xiaolong Liu 2024 Physica Status Solidi - Rapid Research Letters

Light and gas dual-function detection and mutual enhancement based on hyperdoped black silicon

Bingbing Dong, Wenjing Wang, Xiaolong Liu, Hua Li, Yuan Li, Yurui Huang, Xijing Ning, Li Zhao, Jun Zhuang 2024 Optics Express

(oral talk) Effect of rapid thermal annealing on optical and structural properties of fs-laser surface processed Ge

Dmytro Gnatyuk, Behrad Radfar, Hele Savin, Xiaolong Liu 2024

Contactless analysis of surface passivation and charge transfer at the TiO ₂-Si interface

Ramsha Khan, Xiaolong Liu, Ville Vähänissi, Harri Ali-Löytty, Hannu P. Pasanen, Hele Savin, Nikolai V Tkachenko 2024 Physical Chemistry Chemical Physics

(oral talk) Effect Of The Morphology Of Black Silicon Passivated By Alumina On The Performance Of Interdigitated Back Contact Solar Cells

Nabil Khelifati, Ozan Aydın, Bülent Arıkan, Ghania Fortas, Leila Harkat, Ville Vähänissi, Xiaolong Liu, Faouzi Kezzoula, Raşit Turan 2024

Bridging the gap between surface physics and photonics

Pekka Laukkanen, Marko Punkkinen, Mikhail Kuzmin, Kalevi Kokko, Xiaolong Liu, Behrad Radfar, Ville Vähänissi, Hele Savin, Antti Tukiainen, Teemu Hakkarainen, Jukka Viheriälä, Mircea Guina 2024 Reports on Progress in Physics

Improved NH3 Gas Sensing Performance of Femtosecond-Laser Textured Silicon by the Decoration of Au Nanoparticles

Yuan Li, Hua Li, Binbin Dong, Xiaolong Liu, Guojin Feng, Li Zhao 2024 Physica Status Solidi - Rapid Research Letters

Fs-laser significantly enhances both above- and below-bandgap absorption in germanium

Xiaolong Liu, Dmytro Gnatyuk, Julius Halmela, Ville Vähänissi, Hele Savin 2024 OPTICAL MATERIALS EXPRESS

Impact of post-ion implantation annealing on Se-hyperdoped Ge

Xiaolong Liu, Patrick Mc Kearney, Sören Schäfer, Behrad Radfar, Yonder Berencen, Ulrich Kentsch, Ville Vähänissi, Shengqiang Zhou, Stefan Kontermann, Hele Savin 2024 Applied Physics Letters

(oral talk) Hyperdoping germanium with titanium via femtosecond laser processing

Xiaolong Liu, Dmytro Gnatyuk, Ville Vähänissi, Hele Savin 2024

(oral talk) Wide-spectral absorption of femtosecond laser textured germanium

Xiaolong Liu, Julius Halmela 2024

Wide-spectral absorption of femtosecond laser textured germanium

Xiaolong Liu, Julius Halmela 2024 Proceedings of the 7th International Conference on Optics, Photonics and Lasers (OPAL' 2024)

Impact of Pulse Duration on the Properties of Laser Hyperdoped Black Silicon

Patrick Mc Kearney, Sören Schäfer, Xiaolong Liu, Simon Paulus, Ingo Lebershausen, Behrad Radfar, Ville Vähänissi, Hele Savin, Stefan Kontermann 2024 Advanced Photonics Research

(poster) Bosch-etched nanojungle black silicon and its applications

Lingju Meng, Moe Awashra, Xiaolong Liu, Seyed Mehran Mirmohammadi, Ville Jokinen, Sami Franssila 2024

Extended Infrared Absorption in Nanostructured Si Through Se Implantation and Flash Lamp Annealing

Behrad Radfar, Xiaolong Liu, Yonder Berencen, Mohd Saif Shaikh, Slawomir Prucnal, Ulrich Kentsch, Ville Vähänissi, Shengqiang Zhou, Hele Savin 2024 Physica Status Solidi (A) Applications and Materials Science

(oral talk) Impact of upconverting atomic layer deposited Er2O3 on Si solar cell surface passivation

Behrad Radfar, Amr Ghazy, Xiaolong Liu, Ville Vähänissi, Maarit Karppinen, Hele Savin 2024

Effective carrier lifetime in ultrashort pulse laser hyperdoped silicon: sulfur concentration dependence and practical limitations

Sören Schäfer, Xiaolong Liu, Patrick Mc Kearney, Simon Paulus, Behrad Radfar, Ville Vähänissi, Hele Savin, Stefan Kontermann 2024 PHYSICA STATUS SOLIDI A: APPLICATIONS AND MATERIALS SCIENCE

(invited talk) Sulfur-hyperdoped silicon by ultrashort laser processing

Sören Schäfer, Patrick Mc Kearney, Simon Paulus, Xiaolong Liu, Behrad Radfar, Ville Vähänissi, Doris Mutschall, Vesa Koskinen, Michael Serue, Tobias Niemeyer, Michael Seibt, Hele Savin, Stefan Kontermann 2024

Synergic Effect of N and Se Facilitates Photoelectric Performance in Co-Hyperdoped Silicon

Haibin Sun, Xiaolong Liu, Caixia Xu, Long Xu, Yuwei Chen, Haima Yang, Xing Yang, Peng Rao, Shengli Sun, Li Zhao 2024 Nanomaterials

Properties of Black Silicon Layers Fabricated by Different Techniques for Solar Cell Applications

Gagik Ayvazyan, Karen Ayvazyan, Levon Hakhoyan, Xiaolong Liu 2023 Physica Status Solidi - Rapid Research Letters

Excellent Responsivity and Low Dark Current Obtained with Metal-Assisted Chemical Etched Si Photodiode

Kexun Chen, Olli Setälä, Xiaolong Liu, Behrad Radfar, Toni Pasanen, Michael Serue, Juha Heinonen, Hele Savin, Ville Vähänissi 2023 IEEE Sensors Journal

(oral talk) Surface Passivation and Charge Transfer at TiO2/Si Interface

Xiaolong Liu, Ramsha Khan, Hannu Pasanen, Harri Ali-Löytty, Ville Vähänissi, Mika Valden, Nikolai V. Tkachenko, Hele Savin 2023

(poster) Contact formation via femtosecond-laser hyperdoping in silicon optoelectronic devices

Xiaolong Liu, Kexun Chen, Behrad Radfar, Patrick Mc Kearney, Simon Paulus, Sören Schäfer, Michael Serué, Doris Mutschall, Vesa Koskinen, Toni Pasanen, Ville Vähänissi, Mikko Juntunen, Stefan Kontermann, Hele Savin 2023

(poster) Surface Passivation of Si by Atomic Layer Deposited TiO2

Xiaolong Liu, Ville Vähänissi, Hele Savin, Ramsha Khan, Hannu Pasanen, Harri Ali-Löytty, Mika Valden, Nikolai V. Tkachenko 2023

(poster) Highly Sensitive Ultra Violet Sensor

Arto Niemela, Juha Laurila, Toni Hovatta, Heikki Sipilä, Xiaolong Liu, Hele Savin 2023

Optoelectronic properties of black silicon fabricated by femtosecond laser in ambient air: exploring a large parameter space

Behrad Radfar, Kexun Chen, Olli Setälä, Ville Vähänissi, Hele Savin, Xiaolong Liu 2023 Optics Letters

(oral talk) Nanostructured Silicon Hyperdoped with Se by Ion Implantation and Flash Lamp Annealing

Behrad Radfar, Xiaolong Liu, Slawomir Prucnal, Mohd Saif Shaikh, Ulrich Kentsch, Ville Vähänissi, Yonder Berencén, Shengqiang Zhou, Hele Savin 2023

(invited talk) Excellent Responsivity and Low Dark Current Obtained with Black Si Photodiode

Hele Savin, Kexun Chen, Olli Setälä, Xiaolong Liu, Behrad Radfar, Ville Vähänissi 2023

(oral talk) Effective carrier lifetime in ultrashort pulse laser hyperdoped silicon: dopant concentration dependence and practical upper limits

Sören Schäfer, Xiaolong Liu, Patrick Mc Kearney, Simon Paulus, Behrad Radfar, Ville Vähänissi, Hele Savin, Stefan Kontermann 2023

Boron-implanted black silicon photodiode with close-to-ideal responsivity from 200 to 1000 nm

Olli Setälä, Kexun Chen, Toni Pasanen, Xiaolong Liu, Behrad Radfar, Ville Vähänissi, Hele Savin 2023 ACS Photonics

Hyperdoping-regulated room-temperature NO2 gas sensing performances of black silicon based on lateral photovoltaic effect

Wenjing Wang, Hua Li, Xiaolong Liu, Shengxiang Ma, Yang Zhao, Binbin Dong, Yuan Li, Xijing Ning, Li Zhao, Jun Zhuang 2023 Sensors and Actuators B: Chemical

Millisecond-Level Minority Carrier Lifetime in Femtosecond Laser-Textured Black Silicon

Xiaolong Liu, Behrad Radfar, Kexun Chen, Elmeri Pälikkö, Toni Pasanen, Ville Vähänissi, Hele Savin 2022 IEEE Photonics Technology Letters

(oral talk) Carrier recombination in black silicon fabricated by high repetition rate fs-laser

Xiaolong Liu, Behrad Radfar, Toni Pasanen, Ville Vähänissi, Hele Savin 2022

Perspectives on Black Silicon in Semiconductor Manufacturing: Experimental Comparison of Plasma Etching, MACE and Fs-Laser Etching

Xiaolong Liu, Behrad Radfar, Kexun Chen, Olli Setälä, Toni Pasanen, Marko Yli-Koski, Hele Savin, Ville Vähänissi 2022 IEEE Transactions on Semiconductor Manufacturing

(poster) Optoelectronic properties of high repetition rate femtosecond-laser processed black silicon

Xiaolong Liu, Behrad Radfar, Toni Pasanen, Ville Vähänissi, Hele Savin 2022

Tailoring Femtosecond-Laser Processed Black Silicon for Reduced Carrier Recombination Combined with >95% Above-Bandgap Absorption

Xiaolong Liu, Behrad Radfar, Kexun Chen, Toni Pasanen, Ville Vähänissi, Hele Savin 2022 Advanced Photonics Research

Mid-long wavelength infrared absorptance of hyperdoped silicon via femtosecond laser microstructuring

Haibin Sun, Xiaolong Liu, Li Zhao, Jianxin Jia, Changhui Jiang, Jiamin Xiao, Yuwei Chen, Long Xu, Zhiyong Duan, Peng Rao, Shengli Sun 2022 Optics Express

NO2 gas sensor with excellent performance based on thermally modified nitrogen-hyperdoped silicon

Wenjing Wang, Shengxiang Ma, Xiaolong Liu, Yang Zhao, Yuan Li, Hua Li, Xijing Ning, Li Zhao, Jun Zhuang 2022 Sensors and Actuators B: Chemical

(invited talk) Black silicon for PV—Which fabrication technology to choose?

Xiaolong Liu, Behrad Radfar, Kexun Chen, Olli Setälä, Toni Pasanen, Ville Vähänissi, Hele Savin 2021

Photovoltaic Self-Powered Gas Sensing

Xiao-Long Liu, Yang Zhao, Wen-Jing Wang, Sheng-Xiang Ma, Xi-Jing Ning, Li Zhao, Jun Zhuang 2021 IEEE Sensors Journal

Light-optimized photovoltaic self-powered NO₂ gas sensing based on black silicon

Yang Zhao, Xiao Long Liu, Sheng Xiang Ma, Wen Jing Wang, Xi Jing Ning, Li Zhao, Jun Zhuang 2021 Sensors and Actuators, B: Chemical

Light-enhanced room-temperature gas sensing performance of femtosecond-laser structured silicon after natural aging

Xiaolong Liu, Yang Zhao, Li Zhao, Jun Zhuang 2020 Optics Express

Enhanced responsivity of co-hyperdoped silicon photodetectors fabricated by femtosecond laser irradiation in mixed SF₆/NF₃ atmosphere

Shengxiang Ma, Xiaolong Liu, Haibin Sun, Yang Zhao, Yue Hu, Xijing Ning, Li Zhao, Jun Zhuang 2020 Journal of the Optical Society of America B

Large-scale, low-cost, broadband and tunable perfect optical absorber based on phase change material

Nanli Mou, Xiaolong Liu, Tao Wei, Hongxing Dong, Qiong He, Lei Zhou, Yaqiang Zhang, Long Zhang, Shulin Sun 2020 Nanoscale

Light stimulated and regulated gas sensing ability for ammonia using sulfur-hyperdoped silicon

Xiaolong Liu, Shengxiang Ma, Suwan Zhu, Yang Zhao, Xijing Ning, Li Zhao, Jun Zhuang 2019 Sensors and Actuators B: Chemical

Rapid and wide-range detection of NOx gas by N-hyperdoped silicon with the assistance of a photovoltaic self-powered sensing mode

Xiaolong Liu, Yang Zhao, Shengxiang Ma, Suwan Zhu, Xijing Ning, Li Zhao, Jun Zhuang 2019 ACS Sensors