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Effect of the post-annealing temperature on the thermal-decomposed NiO_(x) hole contact layer for perovskite solar cells

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Journal of Advanced Dielectrics 2018年第1期8卷 50-55页

作者： Yuxiao Guo Xingtian Yin Jie Liu Wei Chen Sen Wen meidan que Yapeng Tian Yawei Yang Wenxiu que Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education International Center for Dielectric Research and Shaanxi Engineering Research Center of Advanced Energy Materials and Devices Xi’an Jiaotong University Xi’an 710049 ShaanxiP.R.China

A hysteresis-less inverted perovskite solar cell(PSC)with power conversion efficiency(PCE)of 13.57%was successfully achieved based on the thermal-decomposed NiO_(x) hole contact layer,possessing better electron blocking and hole extraction properties for its suitable work function and high-conduction band edge ***,the transparent and high-crystalline NiO_(x) film is prepared by thermal-decomposing of the solution-derived Ni(OH)_(2) film in our study,which is then employed as hole transport layer(HTL)of the organic–inorganic hybrid ***,the post-annealing treatment,especially for the annealing temperature,could greatly affect the Ni(OH)_(2) decomposition process and the quality of decomposed NiO_(x) *** vital NiO_(x) HTLs with discrepant morphology,crystallinity and transmission certainly lead to a wide range of device *** a result,an annealing process of 400℃/2 h significantly promotes the photovoltaic properties of the NiO_(x) layer and the further device performance.

关键词： NiO_(x) hole transport layer thermally decomposing annealing temperature perovskite solar cell

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Towards Flexible NiOx-based Perovskite Solar Cells

Towards Flexible NiOx-based Perovskite Solar Cells

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第四届新型太阳能电池学术研讨会

作者： Xingtian Yin Peng Chen meidan que Wenxiu que Xi’an Jiaotong University

Organic-inorganic perovskite materials are very suitable for flexible devices because high quality perovskite films can be deposited through a low temperature solution ***, the power conversion efficiency(PCE) of flexible perovskite solar cells is still much lower than that of rigid devices partially due to the poor carrier transport properties of contact films employed in flexible *** this presentation, we will introduce several methods to prepare high quality NiO hole transport films for perovskite solar cells, and the focus will be put on some low temperature derived NiO films which is very suitable for flexible ***, we demonstrated a solution-derived NiO-based inverted planar heterojunction perovskite solar cell with a PCE of as high as 16.47% on an ITO-glass *** NiO film was deposited at a temperature of 130 ℃ without any post *** study on the interfacial carriers transfer and charge recombination processes proved it to be an efficient hole contact for perovskite ***, the low temperature deposition process made it very suitable and attractive for flexible devices.A preliminary PCE of 13.43% was demonstrated with NiO-based flexible perovskite solar cell using an ITO-PEN(polyethylene naphthalate) ***, a solvothermal method was also employed to prepare ultrafine crystalline NiO nanoparticles, which can be well dispersed in ethanol and stable for *** quality NiO films were able to be deposited onto flexible substrates from such kind of NiO colloids, based on which efficient flexible perovskite solar cells can also be achieved.

关键词： NiOx perovskite solar cells crystalline

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Annealing atmosphere effect on Ni states in the thermal-decomposed NiOx films for perovskite solar cell application

Annealing atmosphere effect on Ni states in the thermal-deco...

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第六届新型太阳能电池材料科学与技术学术研讨会

作者： Yuxiao Guo Xingtian Yin Jie Liu Yawei Yang Wei Chen meidan que Wenxiu que Bowen Gao Electronic Materials Research Laboratory Key Laboratory of the Ministry of EducationInternational Center for Dielectric ResearchShaanxi Engineering Research Center of Advanced Energy Materials and DevicesSchool of Electronic & Information EngineeringXi’an Jiaotong University

NiO films with different Ni states are prepared by decomposing the solution-derived Ni(OH) films in varies of atmospheres. All the NiO films exhibit full coverage on the substrates with rough surfaces. Both the air annealing and O annealing result in similar film compositions, which are composed of NiO, NiO and NiOOH. While additional metallic nickel is observed in the N-annealed sample, which is different from the pure NiO powders annealed in N, indicating a complicated decomposition process of Ni(OH) in N atmosphere. The as-prepared NiO films were employed as the hole transport layer of inverted planar perovskite solar cells. Owing to the existence of metallic nickel, an obvious performance degradation is observed for device based on the N-annealed sample. Finally, the champion power conversion efficiency(PCE) of 14.55% is achieved on the device based on the air-annealed NiO film, which should be attributed to the slightly higher content of NiOOH compared to the O-annealed sample.

关键词： Ni(OH)2 Annealing atmosphere Decomposition NiOx Perovskite solar cell

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Photoluminescence and energy transfer of YAG:Ce^(3+),Gd^(3+),Bi^(3+)

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Journal of Advanced Dielectrics 2016年第4期6卷 31-36页

作者： meidan que Wenxiu que Ting Zhou Jinyou Shao Lingbing Kong Electronic Materials Research Laboratory International Center for Dielectric Research Key Laboratory of the Ministry of Education School of Electronic&Information Engineering State Key Laboratory for Manufacturing Systems Engineering Xi'an Jiaotong University Xi'an 710049 ShaanxiPeople's Republic of China School of Materials Science and Engineering Nanyang Technological University Nanyang Avenue Singapore 639798Singapore

In this study,Gd^(3+)and Bi^(3+)ions act to redshift the emission band to orange region,and to enhance significantly the maximum emission of YAG:Ce^(3+).On account that size mismatch between the host and the doped Gd^(3+)ion,the crystal structure turns soft,and the emission spectra are not tuned from 540 to 570 nm but decreased the emission ***,an effective way to increase emission intensity is to introduce Bi^(3+)ion into the YAG:Ce^(3+),Gd^(3+)*** results show partial overlapping between the emission band of Bi^(3+)ion and the excitation band of Ce^(3+)ion,indicating that the energy transfer from Bi^(3+)to Ce^(3+)ions exists in the(Y_(1.94)Ce_(0.06)Gd)Al_(5)O_(12):Bi^(3+)***^(3+)ion can serve as the activator to provide energy for Ce^(3+)ion via cross relaxation ***,the(Y_(1.94)Ce_(0.06)Gd)Al_(5)O_(12):Bi^(3+)phosphor could have potential applications in warm white LEDs.

关键词： YAG:Ce^(3+),Gd^(3+),Bi^(3+)phosphor energy transfer reabsorption.

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