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Efficient defect-controlled photocatalytic hydrogen generation based on near-infrared Cu-In-Zn-S quantum dots

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Nano Research 2018年第3期11卷 1379-1388页

作者： Xiao-Yuan Liu Guozhen Zhang Hao Chen Haowen Li Jun Jiang Yi-Tao Long Zhijun Ning School of Physical Science and Technology ShanghaiTech University Shanghai 201210 China Key Laboratory for Advanced Materials & School of Chemistry and Molecular Engineering East China University of Science and Technology Shanghai 200237 China School of Chemistry and Materials Science Hefei National Laboratory for Physical Sciences at the Microscale and CAS Key Laboratory of Mechanical Behavior and Design of Materials (LMBD) University of Science and Technology of China (USTC) Hefei 230026 China

The development of photocatalysts that can effectively harvest visible light is essential for advances in high-efficiency solar-driven hydrogen generation. Herein, we synthesized water soluble CuInS2 （CIS） and Cu-In-Zn-S （CIZS） quantum dots （QDs） by using one-pot aqueous method. The CIZS QDs are well passivated by glutathione ligands and are highly stable in aqueous conditions. We subsequently applied these QDs as a light harvesting material for photocatalytic hydrogen generation. Unlike most small band gap materials that show extremely low efficienc36 these new QDs display remarkable energy conversion efficiency in the visible and near-infrared regions. The external quantum efficiency at 650 nm is - 1.5%, which, to the best of our knowledge, is the highest value achieved until now in the near-infrared region.

关键词： quantum dots photocatalysis hydrogen generation surface defect

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扭曲二维结构钝化的钙钛矿太阳能电池

物理学报 2019年第15期68卷 111-119页

作者：付鹏飞虞丹妮彭子健龚晋慷宁志军上海科技大学物质学院上海201210 上海硅酸盐研究所上海200050 中国科学院大学北京100049

有机-无机钙钛矿材料是一种新兴的可溶液加工的薄膜太阳能电池材料.通过向钙钛矿中引入低维结构能够显著提高其材料稳定性和器件稳定性.首先,探究了一种双阳离子2,2’-联咪唑(BIM)形成的铅基二维钙钛矿;然后,通过单晶衍射手段发现了一... 详细信息

有机-无机钙钛矿材料是一种新兴的可溶液加工的薄膜太阳能电池材料.通过向钙钛矿中引入低维结构能够显著提高其材料稳定性和器件稳定性.首先,探究了一种双阳离子2,2’-联咪唑(BIM)形成的铅基二维钙钛矿;然后,通过单晶衍射手段发现了一种新型的扭曲二维结构;最后,通过一步旋涂方法将这种扭曲二维结构引入到钙钛矿薄膜中,所得到的太阳能电池器件效率达14%,并且具有较好的稳定性.本文提供了一种新的钙钛矿薄膜的钝化体系,并且直接运用于太阳能电池器件的制备,为提高钙钛矿太阳能电池的稳定性提供了新的发展思路.

关键词：钙钛矿太阳能电池二维结构

Supersaturation controlled growth of MAFAPbI3 perovskite film for high efficiency solar cells

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Science China Chemistry 2018年第10期61卷 1278-1284页

作者： Dong Liu Wenjia Zhou Haoying Tang Pengfei Fu Zhijun Ning School of Physical Science and Technology Shanghai Tech University Shanghai 201210 China Shanghai Institute of Ceramics Chinese Academy of Sciences Shanghai 200050 China University of Chinese Academy of Sciences Beijing 100049 China

Controlling the nucleation and growth of organic-inorganic hybrids perovskite is of key importance to improve the morphology and crystallinity of perovskite films. However, the growth mechanism of perovskite films based on classical crystallization theory is not fully understood. Here, we develop a supersaturation controlled strategy(SCS) to balance the nucleation and crystal growth speeds. By this strategy, we are able to find an ideal supersaturation region to realize a balance of nucleation and crystal growth, which yields highly crystallized perovskite films with micrometer-scale grains. Besides, we provide a thoughtful analysis of nucleation and growth based on the fabrication of the perovskite films. As a result, the highest photovoltaic power conversion efficiencies(PCE) of 19.70% and 20.31% are obtained for the planar and the meso-superstructured devices, respectively. This strategy sheds some light for understanding the film growth mechanism of high quality perovskite film, and it provides a facile strategy to fabricate high efficiency perovskite solar cells.

关键词： perovskite solar cell nucleation and growth supersaturation

Colloidal quantum-dots surface and device structure engineering for high-performance light-emitting diodes

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National Science Review 2017年第2期4卷 170-183页

作者： Yuequn Shang Zhijun Ning School of Physical Science and Technology Shanghai Tech University Shanghai Institute of Ceramics Chinese Academy of Sciences University of Chinese Academy of Sciences

The application of colloidal quantum dots for light-emitting devices has attracted considerable attention in recent years, due to their unique optical properties such as size-dependent emission wavelength, sharp emission peak and high luminescent quantum yield. Tremendous efforts have been made to explore quantum dots for light-emission applications such as light-emitting diodes(LEDs) and light *** performance of quantum-dots-based light-emitting diodes(QD-LEDs) has been increasing rapidly in recent decades as the development of quantum-dots synthesis, surface-ligand engineering and device-architecture optimization. Recently, the external quantum efficiencies of red quantum-dots LEDs have exceeded 20.5% with good stability and narrow emission peak. In this review, we summarize the recent advances in QD-LEDs, focusing on quantum-dot surface engineering and device-architecture optimization.

关键词： colloidal quantum dots light-emitting diodes surface engineering device architecture

Theoretical Study of Using Kinetics Strategy to Enhance the Stability of Tin Perovskite

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Energy & Environmental Materials 2020年第4期3卷 541-547页

作者： Qi Wei Youqi Ke Zhijun Ning School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China

Tin perovskite solar cell received great attention in recent years owing to its optimum bandgap and heavy metal-free *** main concern for the development of tin perovskite is the oxidation from Sn^(2+)to Sn^(4+).Herein,we report a surface hetero-protection strategy to avoid the surface reaction of tin *** types of materials,including low-dimensional tin perovskite,alkali metal halide,and oxides of group IVA element,are exploited as protecting materials on tin perovskite surface with first-principles *** lattice mismatch,oxidation resistance,and interface stability of these materials are investigated to search for ideal protecting-layer *** screening over 30 candidates,we finally obtain 8 suitable materials(SiO_(2),GeO_(2),KCl,Na Br,Cs F,Li F,Li I,CsSn_(2)Br_(5))for hetero-protection of tin *** further understand their application potential in a solar cell device,we then calculate the property of charge transfer between the interface of these materials and tin *** study provides a guide for the experimental realization of efficient and stable tin perovskite solar cell.

关键词： density functional theory interface oxidation stability tin perovskite

Stability improvement under high efficiency—next stage development of perovskite solar cells

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Science China Chemistry 2019年第6期62卷 684-707页

作者： Danni Yu Yue Hu Jiangjian Shi Haoying Tang Wenhao Zhang Qingbo Meng Hongwei Han Zhijun Ning He Tian School of Physical Science and Technology Shanghai Tech University Michael Gr?tzel Center for Mesoscopic Solar Cells Wuhan National Laboratory for OptoelectronicsHuazhong University of Science and Technology Key Laboratory for Renewable Energy Beijing Key Laboratory for New Energy Materials and Devices Institute of PhysicsChinese Academy of Sciences Key Laboratory for Advanced Materials and Institute of Fine Chemicals East China University of Science and Technology

With efficiency of perovskite solar cells(PSCs) overpassing 23%, to realize their commercialization, the biggest challenge now is to boost the stability to the same level as conventional solar cells. Thus, tremendous effort has been directed over the past few years toward improving the stability of these cells. Various methods were used to improve the stability of bulk perovskites,including compositional engineering, interface adjustment, dimensional manipulation, crystal engineering, and grain boundary decoration. Diverse device configurations, carrier transporting layers, and counter electrodes are investigated. To compare the stability of PSCs and clarify the degradation mechanism, diverse characterization methods were developed. Overall stability of PSCs has become one central topic for the development of PSCs. In this review, we summarize the state-of-the-art progress on the improvement of device stability and discuss the directions for future research, hoping it provides an overview of the current status of the research on the stability of PSCs and guidelines for future research.

关键词： stability perovskite solar cell photoelectric device

Band alignment towards high-efficiency NiOx-based Sn-Pb mixed perovskite solar cells

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Science China Materials 2021年第3期64卷 537-546页

作者： Hao Chen Zijian Peng Kaimin Xu Qi Wei Danni Yu Congcong Han Hansheng Li Zhijun Ning School of Physical Science and Technology ShanghaiTech UniversityShanghai201210China Shanghai Institute of Ceramics Chinese Academy of SciencesShanghai200050China School of Chemistry and Chemical Engineering University of Chinese Academy of SciencesBeijing100049China

Narrow-bandgap tin-lead(Sn-Pb)mixed perovskite solar cells(PSCs)play a key role in constructing perovskite tandem solar cells that are potential to overpass Shockley-Queisser limit.A robust,chemically stable and lowtemperature-processed hole transporting layer(HTL)is essential for building high-efficiency Sn-Pb solar cells and perovskite tandem solar ***,we explore a roomtemperature-processed NiOx(L-NiOx)HTL based on nanocrystals(NCs)for Sn-Pb *** comparison with hightemperature-annealed NiOx(H-NiOx)film,the L-NiOx film shows deeper valence band and lower trap density,which increases the built-in potential and reduces carrier recombination,leading to a power conversion efficiency of 18.77%,the record for NiOx-based narrow-bandgap ***,the device maintains about 96%of its original efficiency after 50 *** work provides a robust and room-temperatureprocessed HTL for highly efficient and stable narrow-bandgap PSCs.

关键词： band alignment NiOx Sn-Pb mixed perovskite solar cell

Hole-transporting layer-free inverted planar mixed lead-tin perovskite-based solar cells

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Frontiers of Optoelectronics 2017年第2期10卷 103-110页

作者： Yuqin LIAO Xianyuan JIANG Wenjia ZHOU Zhifang SHI Binghan LI Qixi MI Zhijun NING Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai 200050 China School of Physical Science and Technology ShanghaiTech University Shanghai 201210 China University of Chinese Academy of Sciences Beijing 100049 China

Mixed lead-tin （Pb-Sn） perovskites present a promising strategy to extend the light-harvesting range of perovskite-based solar cells （PSCs）. The use of electron- transporting layer or hole-transporting layer （HTL） is critical to achieve high device efficiency. This strategy, however, requires tedious layer-by-layer fabrication as well as high-temperature annealing for certain oxides. In this work, we fabricated HTL-free planar FAPb0.5Sn0.5I3 PSCs with the highest efficiency of 7.94%. High short- circuit current density of 23.13 mA/cm2 was attained, indicating effective charge extraction at the ITO/ FAPb0.5Sn0.5I3 interface. This finding provides an alter- native strategy to simplify the manufacture of single- junction or tandem PSCs.

关键词： solar cell perovskite hole-transporting layer(HTL) interface engineering