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南京大學(xué)物理學(xué)院接收2017年推薦免試研究生細(xì)則
http://physics.nju.edu.cn/2016-4/163115_373181.html

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博士研究生朱衛(wèi)東等有關(guān)“Coarsening of one-step deposited organolead triiodide perovskite films via Ostwald ripening for high efficiency planar-heterojunction solar cells”的研究論文發(fā)表在Dalton Trans., 2016,45, 7856-7865
DOI: 10.1039/C6DT00900J
摘要：
Large organolead triiodide perovskite (OTP) grains with little intragranular defects are beneficial to minimize carrier recombination, hence boosting cell performance. However, OTP films deposited by the widely used one-step spin-coating route are usually composed of small grains, because the poor thermal stability of OTP inherently restricts the processing window (temperature, time) during the film preparation, thus limiting grain coarsening in the film. Herein, the remarkable grain coarsening via Ostwald ripening in one-step deposited OTP films has been successfully realized by a facile and effective post-synthesis high-temperature heating treatment assisted with spin-coated CH3NH3I. By systematically investigating the heating treatment parameters, a high-quality OTP film with an enlarged average grain size from ∼280 nm to 1.2 μm, greatly enhanced crystallinity, and excellent stoichiometry is achieved. Benefiting from such improved features, this modified film shows significantly reduced defect states corresponding to the decrease of recombination centers, as well as enhanced carrier transport and injection properties, which lead to the dramatically boosted efficiency from 14.54% to 16.88% for planar-heterojunction solar cells. More importantly, the improved OTP film quality provides the possibility of thickening the absorber layer of cells to realize more sufficient absorption without serious aggravation of charge recombination. By further optimizing the thickness of the coarsened OTP films, highly efficient cells with relatively excellent reproducibility and an optimal efficiency of 19.24% are achieved.

南京大學(xué)物理學(xué)院Solar Photon Conversion（太陽(yáng)光子轉(zhuǎn)換）研究組

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南京大學(xué)物理學(xué)院接收2017年推薦免試研究生細(xì)則
http://physics.nju.edu.cn/2016-4/163115_373181.html

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博士研究生李發(fā)明等有關(guān)“Microstructure modulation of the CH3NH3PbI3 layer in perovskite solar cells by 2-propanol pre-wetting and annealing in a spray-assisted solution process”的研究論文發(fā)表在J. Mater. Chem. A, 2016,4, 11372-11380
DOI: 10.1039/C6TA04600B
摘要：
As the light absorption layer, a CH3NH3PbI3 perovskite film with a fully and homogeneously covered flat surface is crucially important for perovskite photovoltaic devices. Herein, the sequential method is improved by introducing a spray-assisted solution process (SSP) instead of the commonly used dipping process in CH3NH3PbI3 perovskite film deposition. The morphology analysis for PbI2 films found that the airflow of the spray pre-wetting process provides a driving force for accelerating the dissolution and deep infiltration, which is helpful to form a mesoporous PbI2 scaffold. So the 2-propanol (IPA) pre-wetting has advantages to complete the reaction of PbI2 and CH3NH3I through the diffusion channel in the grain boundary and on the surface of the PbI2 film. Furthermore, the grain size and surface coverage of the film can be controlled effectively by a facile IPA pre-wetting process in the SSP. Meanwhile, the influence of the annealing process on the crystallization, chemical composition, microstructures and carrier transport properties of the perovskite films were investigated. Our results showed that an optimum annealing temperature and time can reduce crystal defects in the film and weaken the hysteresis phenomenon of the perovskite solar cell. Efficient mesoporous structured perovskite solar cells were fabricated with an optimal PCE of 14.2%, because of the improved perovskite film preparation method.

南京大學(xué)物理學(xué)院Solar Photon Conversion（太陽(yáng)光子轉(zhuǎn)換）研究組-1

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博士研究生楊潔等有關(guān)“A flexible and high-performance all-solid-state supercapacitor device based on Ni3S2 nanosheets coated ITO nanowire arrays on carbon fabrics”的研究論文發(fā)表在RSC Adv., 2016,6, 75186-75193
DOI: 10.1039/C6RA14174A
摘要：
A Ni3S2 coated indium tin oxide (ITO) core–shell structure on flexible carbon fabrics (CF@ITO@Ni3S2) was prepared by electrodepositing Ni3S2 nanosheets on ITO nanowire arrays grown on flexible carbon fabrics by chemical vapor deposition. The ITO nanowires on carbon fabrics formed a conductive support which offered a large contact surface with the electrolyte and hence was accessible for ion diffusion. Ni3S2 nanosheets were uniformly deposited on the ITO nanowire. The maximum mass loading of Ni3S2 on ITO nanowire array coated carbon fabrics could reach about a quadruple higher amount than that on the bare carbon fabrics. The prepared CF@ITO@Ni3S2 electrodes exhibited excellent capacitive performance compared with Ni3S2 coated bare carbon fabric electrodes (CF@Ni3S2). High areal capacitance of 3.85 F cm−2 and gravimetric capacitance of 1865 F g−1 were achieved when the mass loadings of Ni3S2 on the ITO nanowire arrays were around 4.12 mg cm−2 and 0.96 mg cm−2, respectively. The sample with 0.96 mg cm−2 of Ni3S2 could also deliver 1372 F g−1 when charge–discharge current density reached 50 mA cm−2, indicating the excellent rate capability of the structure. The assembled all-solid-state full cell based on symmetric electrodes obtained a relatively high areal capacitance of 736 mF cm−2 at 8 mA cm−2, which delivered a maximum energy density of 1.02 mW h cm−3 at a power density of 39.9 W cm−3. The outstanding capacitive performance suggests that the CF@ITO@Ni3S2 device was promising for application in an inexpensive energy storage system.

南京大學(xué)物理學(xué)院Solar Photon Conversion（太陽(yáng)光子轉(zhuǎn)換）研究組-2

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碩士研究生易勇等有關(guān)“Spontaneous configurational evolution induced by an in situ self-formed p-type CuI interface layer in perovskite solar cells”的研究論文發(fā)表在RSC Adv., 2016,6, 82759-82762
DOI: 10.1039/C6RA19702G
摘要：
The undesirable corrosion reaction between CH3NH3PbI3 and Cu cathode can form a p-type CuI layer in situ. The effect can promote an amazing evolution of the configuration of the hole-transport-material-free perovskite solar cells. The evolution can boost the cell efficiency by a dozen-fold.

南京大學(xué)物理學(xué)院Solar Photon Conversion（太陽(yáng)光子轉(zhuǎn)換）研究組-3

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47樓2016-09-08 07:53:26

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博士研究生包春雄等有關(guān)“Highly Flexible Self-Powered Organolead Trihalide Perovskite Photodetectors with Gold Nanowire Networks as Transparent Electrodes”的研究論文發(fā)表在ACS Appl. Mater. Interfaces, 2016, 8 (36), pp 23868–23875
DOI: 10.1021/acsami.6b08318
摘要：
Organolead trihalide perovskites (OTPs) such as CH3NH3PbI3 (MAPbI3) have attracted much attention as the absorbing layer in solar cells and photodetectors (PDs). Flexible OTP devices have also been developed. Transparent electrodes (TEs) with higher conductivity, stability, and flexibility are necessary to improve the performance and flexibility of flexible OTP devices. In this work, patterned Au nanowire (AuNW) networks with high conductivity and stability are prepared and used as TEs in self-powered flexible MAPbI3 PDs. These flexible PDs show peak external quantum efficiency and responsivity of 60% and 321 mA/W, which are comparable to those of MAPbI3 PDs based on ITO TEs. The linear dynamic range and response time of the AuNW-based flexible PDs reach ∼84 dB and ∼4 μs, respectively. Moreover, they show higher flexibility than ITO-based devices, around 90%, and 60% of the initial photocurrent can be retained for the AuNW-based flexible PDs when bent to radii of 2.5 and 1.5 mm. This work suggests a high-performance, highly flexible, and stable TE for OTP flexible devices.

南京大學(xué)物理學(xué)院Solar Photon Conversion（太陽(yáng)光子轉(zhuǎn)換）研究組-4

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