共查询到20条相似文献,搜索用时 15 毫秒
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高效率的有机电致发光器件 总被引:2,自引:0,他引:2
有机电致发光器件 (OL EDs)的发光机理包括电子和空穴从电极的注入、激子的形成及复合发光 ,其中 ,空穴和电子的注入平衡是非常重要的。为了平衡载流子的注入以得到高效率和稳定性好的器件 ,人们不仅使用了电子注入更为有效的 L i F/ Al[1] 和 Cs F/ Al[2 ] 等复合电极 ,同时也使用了空穴缓冲层 ,如 S.A.Van Slyke等 [3]在ITO和 NPB之间使用 Cu Pc,使得器件的稳定性得到了明显的提高 ;A.Gyoutoku等[4 ] 用碳膜使器件的半寿命超过 3 5 0 0小时 ;最近 ,Y.Kurosaka等 [5]和 Z.B.Deng[6 ]分别在 ITO和空穴传输层之间插入一薄层 Al… 相似文献
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采用脉冲激光沉积(PLD)技术,在20、200、400和600 oC下制备出了高质量的ZnS薄膜.XRD分析结果表明,PLD法制备的ZnS多晶薄膜为立方闪锌矿结构而并非Murali报道的六方的纤锌矿结构,并沿(111)方向择优取向生长.Raman光谱进一步证明了在350 cm-1出现了立方相ZnS薄膜的A1振动模式.通过ZnS薄膜的SEM平面和断面图可观察到采用PLD技术生长出了非常密实、光滑、均匀的薄膜.PLD生长的ZnS薄膜的颗粒远小于化学浴沉积的CdS颗粒,这也是影响其电池效率的主要原因.XRF化学组成分析结果表明ZnS薄膜符合化学计量比,但略微富S.最后通过光吸收谱测得不同温度下的ZnS薄膜的光学带隙在3.2~3.7 eV,并随薄膜沉积温度的升高,光学带隙反而增加.采用宽带隙的ZnS缓冲层材料,与CdS(2.4 eV)相比,可以增加电池蓝波段的响应. 相似文献
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铜铟硒薄膜太阳能电池的几个基础问题研究 总被引:2,自引:0,他引:2
文章简述了铜铟硒(CIS)薄膜电池的性能特点和研究现状,重点提出了影响其规模化推广的几个基础问题,包括:射频溅射法直接制备CIS薄膜、省略硒化工艺的问题;ZnO替代CdS作为CIS薄膜电池的缓冲层材料的问题;Na^+离子对CIS薄膜及电池性能的作用及机制问题.这几个基础问题的研究成果,可以为CIS薄膜电池产业化探索新的道路。 相似文献
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氧化硅薄膜是半导体工业中常见的薄膜材料,通常采用化学气相沉积方法制备。但是这种制备方法存在缺欠。采用磁控溅射的方法首先在石英衬底上制备了氧化硅薄膜。研究了射频功率、氧气含量和溅射压强对氧化硅薄膜沉积速率的影响。发现沉积速率随着射频功率的增加而增加;随着氧气含量的增加,先减小后增大;当溅射压强在0.4~0.8 Pa之间变化时,沉积速率变化很小,当溅射压强超过0.8 Pa时沉积速率迅速下降。讨论了不同生长条件下造成氧化硅薄膜生长速率变化的原因。 相似文献
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Apichat Pangdam Supeera Nootchanat Chutiparn Lertvachirapaiboon Ryousuke Ishikawa Kazunari Shinbo Keizo Kato Futao Kaneko Sanong Ekgasit Akira Baba 《Particle & Particle Systems Characterization》2017,34(11)
Gold quantum dots (AuQDs) are employed as photosensitizers in organic thin‐film solar cells (OSCs) to improve their photoelectric conversion properties. Three types of AuQDs with different fluorescence emission wavelengths are used: blue (B‐AuQDs), green (G‐AuQDs), and red (R‐AuQDs). AuQDs are loaded into the poly(3,4‐ethylenedioxythiophene):poly(styrene sulfonate) thin‐film layer of OSCs. UV–vis spectra, atomic force microscope images, current density–voltage characteristics, and impedance spectra of the fabricated devices are measured for the three aforementioned types of AuQDs. All types of AuQDs improve the photoelectric conversion properties, and the G‐AuQD‐loaded OSCs exhibit the best improvement, exhibiting an efficiency increase of 10% compared with OSCs without the AuQDs. The fluorescence/photosensitization of the AuQDs plays an important role in the enhancement of the OSCs. Finite‐difference time‐domain simulations indicate increased electric field intensity due to a small degree of AuQDs aggregation. 相似文献
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针对应用于薄膜太阳能电池的一种混合陷光结构进行了分析研究,该结构由位于电池正面的电介质颗粒和位于电池背面的金属颗粒构成.运用有限时域差分法模拟分析了正面电介质颗粒与背面金属颗粒对光吸收增强的不同作用范围.运用电场图分析了其对光吸收增强的机制,包括两种颗粒的散射作用和金属纳米颗粒的表面等离子体近场增强作用.分别优化了正面电介质颗粒和背面金属颗粒的材料、大小等参量,获得了一种优化后的混合陷光结构.实验表明带有这种混合陷光结构的电池短路电流密度相对于参考电池提高了30.3%,该方法为提高薄膜太阳能电池效率提供了新思路. 相似文献
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柔性太阳电池具有重量轻、可卷对卷连续生产、可卷曲、不易破碎、便于携带和可穿戴等特点,可在多种领域为人们提供电力,具有非常广泛的应用前景。近年来,在基于刚性衬底的有机/无机杂化钙钛矿太阳电池(PSC)展示了出色的功率转换效率之后,柔性PSC研究也受到了人们的广泛关注。目前,柔性PSC的转换效率已经达到了18.1%。本文介绍了近年来柔性PSC领域的相关研究工作,综述了已应用于柔性PSC的柔性基底、透明电极和界面传输层等关键材料近来的发展,并探讨了这些材料应用于柔性PSC时的优势和面临的主要问题,最后对柔性PSC未来的发展进行了展望。 相似文献
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提出了一种含有光锥光子晶体防反射层和四棱锥光栅背反射层的a-Si薄膜太阳能电池结构,吸收层厚1μm,总厚度为1.45μm。根据光子晶体及亚波长光栅的衍射特性,利用严格耦合波方法对器件参数进行了优化。计算结果表明:当光锥结构倾角θ=72°、晶格常数T1=1 200 nm、介质底半径r=100 nm时,防反射层的透射率较高,在300~600 nm波长范围内,该薄膜太阳能电池的吸收效率比不含防反射层电池提高了11.54%;当四棱锥光栅结构周期L=1.2μm、占空比f=0.38、槽深h5=560 nm时,背反射层的反射效果较好,在600~850 nm波长范围内,电池的吸收效率提高了3.75%。所设计的薄膜电池结构在波长为300~750 nm、入射角为0°~75°范围内的吸收效率均在80%以上,平均吸收效率达92%,满足太阳电池对宽频谱、广角度的光俘获的要求。 相似文献
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为了提高有机太阳能电池(OSCs)的性能,增强器件在空气中的稳定性,研究了TiO_2薄膜作为阴极缓冲层对OSCs器件性能的影响。制备了结构为ITO/TiO_2/C70/Rubrene/Mo O3/Al的OSCs器件。首先,通过测量器件效率,考察了TiO_2薄膜对Rubrene/C70电池的性能影响。接着,通过控制TiO_2薄膜厚度,研究了TiO_2厚度对器件性能的影响。实验结果显示,当TiO_2修饰层厚度比较薄时,器件的各性能参数较低,随着TiO_2厚度的不断增加,器件的各性能参数呈上升趋势;当TiO_2厚度为81 nm时,器件的各性能参数达到最佳,器件的功率转换效率为1.09%,电流密度为2.55 m A·cm-2,开路电压为0.88 V,填充因子为48.69%;当TiO_2厚度继续增加时,器件的各性能参数开始下降。对比没有TiO_2阴极修饰层的器件,最优时的Jsc、Voc、FF和PCE分别提高了37%、21%、17%和91%,并阐述了性能提高的原因。 相似文献
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Kashif Javaid Jingjing Yu Weihua Wu Jun Wang Hongliang Zhang Junhua Gao Fei Zhuge Lingyan Liang Hongtao Cao 《固体物理学:研究快报》2018,12(1)
In this article, we report the growth of zinc‐tin nitride (ZnSnN2) thin films as a potential absorber for photovoltaic applications by fabricating a heterojunction of n‐ZnSnN2/p‐SnO. The performance of the heterojunction has been monitored through selective deposition of top electrode with different materials (Ni/Au or Al). The electron‐transfer process from the ZnSnN2 layer to the cathode is facilitated by selecting metal electrode with relatively low work function, which also boosts up the electron injection or/and extraction. The diode exhibits a good J–V response in the dark with a rectification ratio of 3 × 103 at 1.0 V and an ideality factor of 4.2 in particular with Al as the top electrode. Under illumination, the heterostructure solar cell demonstrates a power conversion efficiency of ≈0.37% with an open circuit voltage of 0.25 V and a short circuit current density of 4.16 mA cm?2. The prime strategies, on how to improve solar cell efficiency concerning band offsets and band alignment engineering are also discussed. 相似文献
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采用F16CuPc作为有机太阳能电池的阳极缓冲层可使器件的性能得到显著提高。F16CuPc的引入,一方面可以实现CuPc分子的定向生长,从而改善CuPc薄膜的结晶度,提高其空穴迁移率;另一方面在F16CuPc/CuPc界面处可形成偶极层,改善空穴的输出效率。以上两个作用有效提高了器件的载流子收集效率,降低了器件的串联电阻和光生载流子复合几率,从而提高了器件的短路电流和填充因子。同时,F16CuPc的引入使器件的内建电场增大,提高了器件的开路电压。 相似文献
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采用低压化学气相沉积方法在玻璃衬底上制备了B掺杂的ZnO(BZO)薄膜,通过氢退火对BZO进行处理,然后作为前电极进行了非晶硅薄膜太阳能电池的制备及性能研究。结果表明:在氢气气氛下退火后,BZO薄膜的载流子浓度基本无变化,但Hall迁移率显著提高,这使得BZO薄膜的导电能力提高;当采用厚度较小、透光率较高的BZO薄膜进行氢退火后作为前电极结构时,非晶硅薄膜太阳能电池的短路电流密度提高0.3~0.4 mA/cm2,电池的转化效率提高0.2%。实验结果可为通过优化前电极结构来提高非晶硅薄膜太阳能电池转化效率提供一种简易的方法。 相似文献
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ABSTRACT Energy losses in solar cells caused by the spectral mismatch can be reduced by adapting the solar spectrum using a downconversion material where one higher energy visible photon is ‘cut' into two lower energy near-infrared photons that both can be absorbed by the solar cell. Downconversion with the (Pr3+, Yb3+) couple in YF3 is investigated. Based on analysis of luminescence and diffuse reflectance spectra it is evident that two-step energy transfer takes place from the 3P0 level of Pr3+ (around 490 nm) exciting two Yb3+ to the 2F5/2 level giving emission around 980 nm. The transfer efficiency increases with Yb3+ concentration and is 86% for YF3 doped with 0.5% Pr3+ and 30% Yb3+. Due to concentration quenching the intensity of emission from Yb3+ is strongly reduced and the 2F5/2 emission intensity reaches a maximum for the sample with 0.5% Pr3+ and 2–5% Yb3+ at 300 K. Temperature dependent measurements reveal the role of the Pr3+ 1G4 level in the energy transfer between Pr3+ and Yb3+. Back-transfer of excitation energy from the Yb3+ 2F5/2 level to the 1G4 level of Pr3+ occurs and quenches the Yb3+ emission. The quenching is shown to become more efficient between 4 and 50 K due to faster phonon-assisted energy transfer between the Yb3+ donors. Upon raising the temperature from 50 to 300 K, the luminescence life time of the Yb3+ emission increases again because the small energy difference between the Pr3+ (1G4) level and the Yb3+ (2F5/2) level (~300 cm?1) which makes the 1G4 less efficient as a trap for the excitation energy. The present results give insight into factors involved in the concentration quenching in downconversion materials based on the (Pr3+, Yb3+) couple. 相似文献
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A. M. Polikanin O. V. Goncharova S. A. Sergienya V. F. Gremenok V. B. Zalesskii 《Journal of Applied Spectroscopy》2004,71(5):747-752
The dependence of the microstructure and spectral parameters of thin cadmium sulfide layers on the thickness of these layers and conditions of their chemical deposition from salt solutions has been investigated by methods of absorption spectroscopy and atomic-force microscopy. The chemical composition of the mixture of salt solutions and conditions of deposition of homogeneous buffer layers of definite thickness, the optimum structure, and reproducible composition have been determined on the basis of experimental data. Our investigations have made it possible to fabricate film-type solar cells based on Cu(In,Ga)Se2 with a conversion efficiency of 10–11%. 相似文献