为了提高钙钛矿太阳能电池在潮湿环境中的稳定性,采用一步法,通过在DMF中混合(EDA)I_2、(FA)I和Pb I_2,将乙二胺离子引入钙钛矿晶格,成功制备了一种具有较高稳定性的二维片层状的钙钛矿结构薄膜。通过原位掠入射X射线衍射(GIXRD)、X射...为了提高钙钛矿太阳能电池在潮湿环境中的稳定性,采用一步法,通过在DMF中混合(EDA)I_2、(FA)I和Pb I_2,将乙二胺离子引入钙钛矿晶格,成功制备了一种具有较高稳定性的二维片层状的钙钛矿结构薄膜。通过原位掠入射X射线衍射(GIXRD)、X射线衍射(XRD)、扫描电子显微镜(SEM)、紫外–可见吸收光谱(UV-Vis)和原子力显微镜(AFM)等方法检测分析(EDA)(FA)_2[Pb_3I_(10)]在低湿度及高湿度环境下的结构、形貌以及光学性能变化。结果表明:制备的(EDA)(FA)_2[Pb_3I_(10)]薄膜在相同湿度环境下比当前广泛应用于钙钛矿太阳能电池的甲胺铅碘薄膜(CH_3NH_3PbI_3)稳定性更高;薄膜的光学带隙约为1.67 e V,与太阳能电池最佳带隙比较接近。另外,(EDA)(FA)_2[Pb_3I_(10)]薄膜在可见光范围吸光性能较好;薄膜的粗糙度很小,适合制备太阳能电池,而且,成本较硅基太阳能电池低廉,在分子水平较CH_3NH_3PbI_3的可调谐性更大,使钙钛矿太阳能电池在未来大面积应用成为可能。展开更多
The X-ray diffraction beamline developed at Shanghai Synchrotron Radiation Facility(SSRF)is located at the BL14B1 bending magnet port of the 3.5 Ge V storage ring. The beamline optics is based on a collimating mirror,...The X-ray diffraction beamline developed at Shanghai Synchrotron Radiation Facility(SSRF)is located at the BL14B1 bending magnet port of the 3.5 Ge V storage ring. The beamline optics is based on a collimating mirror,a sagittally focused double crystal monochromator and a focusing mirror. Photon flux of 4.43 × 1011phs/s at10 ke V is obtained. The primary instrument equipped in the experimental end-station is a Huber 5021 sixcycle diffractometer. BL14B1 is a general purpose X-ray diffraction beamline and focused on material science,condensed matter physics and other relevant fields looking for structural information.展开更多
Ionic defects, such as oxygen vacancies, play a crucial role in the magnetic and electronic states of transition metal oxides. Control of oxygen vacancy is beneficial to the technological applications, such as catalys...Ionic defects, such as oxygen vacancies, play a crucial role in the magnetic and electronic states of transition metal oxides. Control of oxygen vacancy is beneficial to the technological applications, such as catalysis and energy conversion. Here, we investigate the electronic structure of SrCoO3-x as a function of oxygen content(x). We found that the hybridization extent between Co 3d and O 2p increased with the reduction of oxygen vacancies. The valence band maximum of SrCoO2.5+δ has a typical O 2p characteristic. With further increasing oxygen content, the Co ions transform from a high spin Co3+ to an intermediate spin Co4+, resulting in a transition of SrCoO3-x from insulator to metal. Our results on the electronic structure evolution with the oxygen vacancies in SrCoO3-x not only illustrate a spin state transition of Co ions,but also indicate a perspective application in catalysis and energy field.展开更多
基金National Natural Science Foundation of China(11405253,U1332205)Youth Innovation Promotion Association CAS and the Research Program of Science and Technology Commission of Shanghai Municipality(14DZ2261200)
文摘为了提高钙钛矿太阳能电池在潮湿环境中的稳定性,采用一步法,通过在DMF中混合(EDA)I_2、(FA)I和Pb I_2,将乙二胺离子引入钙钛矿晶格,成功制备了一种具有较高稳定性的二维片层状的钙钛矿结构薄膜。通过原位掠入射X射线衍射(GIXRD)、X射线衍射(XRD)、扫描电子显微镜(SEM)、紫外–可见吸收光谱(UV-Vis)和原子力显微镜(AFM)等方法检测分析(EDA)(FA)_2[Pb_3I_(10)]在低湿度及高湿度环境下的结构、形貌以及光学性能变化。结果表明:制备的(EDA)(FA)_2[Pb_3I_(10)]薄膜在相同湿度环境下比当前广泛应用于钙钛矿太阳能电池的甲胺铅碘薄膜(CH_3NH_3PbI_3)稳定性更高;薄膜的光学带隙约为1.67 e V,与太阳能电池最佳带隙比较接近。另外,(EDA)(FA)_2[Pb_3I_(10)]薄膜在可见光范围吸光性能较好;薄膜的粗糙度很小,适合制备太阳能电池,而且,成本较硅基太阳能电池低廉,在分子水平较CH_3NH_3PbI_3的可调谐性更大,使钙钛矿太阳能电池在未来大面积应用成为可能。
基金Supported by the National Natural Science Foundation of China(Nos.11405253,U1332205,21203235 and 11175239)
文摘The X-ray diffraction beamline developed at Shanghai Synchrotron Radiation Facility(SSRF)is located at the BL14B1 bending magnet port of the 3.5 Ge V storage ring. The beamline optics is based on a collimating mirror,a sagittally focused double crystal monochromator and a focusing mirror. Photon flux of 4.43 × 1011phs/s at10 ke V is obtained. The primary instrument equipped in the experimental end-station is a Huber 5021 sixcycle diffractometer. BL14B1 is a general purpose X-ray diffraction beamline and focused on material science,condensed matter physics and other relevant fields looking for structural information.
基金supported by the National Key R&D program of China(2016YFA0401002)the National Natural Science Foundation of China(11574365,11474349 and 11375228)
文摘Ionic defects, such as oxygen vacancies, play a crucial role in the magnetic and electronic states of transition metal oxides. Control of oxygen vacancy is beneficial to the technological applications, such as catalysis and energy conversion. Here, we investigate the electronic structure of SrCoO3-x as a function of oxygen content(x). We found that the hybridization extent between Co 3d and O 2p increased with the reduction of oxygen vacancies. The valence band maximum of SrCoO2.5+δ has a typical O 2p characteristic. With further increasing oxygen content, the Co ions transform from a high spin Co3+ to an intermediate spin Co4+, resulting in a transition of SrCoO3-x from insulator to metal. Our results on the electronic structure evolution with the oxygen vacancies in SrCoO3-x not only illustrate a spin state transition of Co ions,but also indicate a perspective application in catalysis and energy field.
