Browsing by Author "Zhang, Lin"

Now showing 1 - 3 of 3

Conjugated Molecules “Bridge”: Functional Ligand toward Highly Efficient and Long-Term Stable Perovskite Solar Cell
(2019-04-25) Dong, Hua; Xi, Jun; Zuo, Lijian; Li, Jingrui; Yang, Yingguo; Wang, Dongdong; Yu, Yue; Ma, Lin; Ran, Chenxin; Gao, Weiyin; Jiao, Bo; Xu, Jie; Lei, Ting; Wei, Feijie; Yuan, Fang; Zhang, Lin; Shi, Yifei; Hou, Xun; Wu, Zhaoxin
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Interfacial ligand passivation engineering has recently been recognized as a promising avenue, contributing simultaneously to the optoelectronic characteristics and moisture/operation tolerance of perovskite solar cells. To further achieve a win-win situation of both performance and stability, an innovative conjugated aniline modifier (3-phenyl-2-propen-1-amine; PPEA) is explored to moderately tailor organolead halide perovskites films. Here, the conjugated PPEA presents both “quasi-coplanar” rigid geometrical configuration and distinct electron delocalization characteristics. After a moderate treatment, a stronger dipole capping layer can be formed at the perovskite/transporting interface to achieve favorable banding alignment, thus enlarging the built-in potential and promoting charge extraction. Meanwhile, a conjugated cation coordinated to the surface of the perovskite grains/units can form preferably ordered overlapping, not only passivating the surface defects but also providing a fast path for charge exchange. Benefiting from this, a ≈21% efficiency of the PPEA-modified solar cell can be obtained, accompanied by long-term stability (maintaining 90.2% of initial power conversion efficiency after 1000 h testing, 25 °C, and 40 ± 10 humidity). This innovative conjugated molecule “bridge” can also perform on a larger scale, with a performance of 18.43% at an area of 1.96 cm2.
Experimental investigation on flue gas condensation heat recovery system integrated with heat pump and spray heat exchanger
(2024-03) Zhang, Qunli; Liu, Tao; Cheng, Xuanrui; Guo, Shuaifei; Zhang, Lin; Lü, Xiaoshu
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
To deeply recover the flue gas condensation heat, a flue gas condensation heat recovery system that combines a compression heat pump (FGCHR-HP) is proposed. An experimental bench of the FGCHR-HP system was established to explore the thermal properties of the system under variable operating conditions. The experimental results show that when the inlet water temperature of the heat pump condensing heat exchanger is 50 °C and the flow rate is 40 L/min, the optimal experimental conditions are achieved. Under this working condition, the heat efficiency is 13.8 %, and the exhaust gas temperature is 26.9 °C. At the same time, the flue gas moisture recovery is up to 6.5–7.0 kg/hour, which is better than other boilers.The payback period of the FGCHR-HP system is 3.4 years. The system has achieved significant energy-saving and water-saving effects, and has certain promotion and application prospects.
Power Profiling Model for RISC-V Core
(2023-06-12) Zhang, Lin
Sähkötekniikan korkeakoulu | Master's thesis
The reduction of power consumption is considered to be a critical factor for efficient computation of microprocessors. Therefore, it is necessary to implement a power management system that is aware of the computational load of the CPU cores. To enable such power management, this project aims to develop a power profiling model for the RISC-V core. TheSyDeKick verification environment was used to develop the power profiling models. Additionally, Python-controlled mixed mode simulations of C-programs compiled for A-Core were conducted to obtain needed data for the power profiling of the digital circuitry. The proposed methodology could employ a time-varying power consumption profiling for the A-Core RISC-V microprocessor core which depends on software, voltage, and clock frequency. The results of this project allow for the creation of parameterized power profiles for the A-Core, which can contribute to more efficient and sustainable computing.