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¸ÆîÑ¿óÐÍÑõ»¯ÎïÌúµçÌåµÄ¿É¼û¹â²¨¶Î¹âµçÑо¿ 2013£¬nature-Perovskite oxides for visible-light-absorbing ferroelectric and photovoltaic materials ¹Ø¼ü´Ê£ºÌúµç²ÄÁÏ ¹â·üЧӦ ¿É¼û¹â ´øÏ¶ ±¨µÀÁËÄÜ´ÓÈëÉä¹â²úÉúµçÁ÷µÄÒ»ÖÖÑõ»¯Îï¡£×÷ΪÌúµç²ÄÁÏÌØÕ÷Ö®Ò»µÄ×Ô·¢¼«»¯¶ÔÓÚÌ«ÑôÄÜµç³ØÓ¦ÓþßÓÐÎüÒýÁ¦£¬ÒòΪÓɹâÎüÊÕ²úÉúµÄÕýµçºÉºÍ¸ºµçºÉ¾ßÓб˴˷ֿªµÄ×ÔÈ»ÇãÏò£¬ÕâʹµÃËüÃǸüÈÝÒ×±»¸ßЧÊÕ¼¯¡£Òź¶µÄÊÇ£¬´ó¶àÊýÒÑÖªµÄÌúµç²ÄÁ϶¼ÓбȽϿíµÄ½û´ø£¬¼´ËüÃÇÖ»ÎüÊÕ¹¹³ÉÌ«Ñô¹âÆ×һС²¿·ÖµÄ¸ßÄܹâ×Ó¡£ÏÖÔÚ£¬±öϦ·¨ÀûÑÇ´óѧ»¯Ñ§ÏµµÄ°²µÂ³・°¢Ä·µÈÈË·¢ÏÖ£¬¿ÉÒÔ¶ÔÒ»ÖÖ¾µäµÄÌúµç²ÄÁϽøÐл¯Ñ§¸ÄÔ죬ÔÚ´ó·¶Î§ÄÚµ÷½ÚÆä´øÏ¶£¬´Ó¶øÔÚÕû¸öÌ«Ñô¹âÆ×É϶¼ÄÜʵÏÖÇ¿ÎüÊպ͹âµçÁ÷Éú³É¡£ °²µÂ³?°¢Ä·Ñо¿ÍŶÓͨ¹ý³£¹æµÄ¹Ì̬·½·¨£¬ÀûÓÃÁ®¼ÛºÍÎÞ¶¾ÐÔµÄÔªËØÖÆ³ÉÁ˵¥Ïà¹ÌÌåÑõ»¯Îï[KNbO3]1-x[BaNi1/2Nb1/2O3-¦Ä]x (KBNNO)¡£ÕâÀàÑõ»¯Îï¼È¾ßÓÐÌúµçÐÔÖÊ£¬»¹±íÏÖ³öÁ˱仯·¶Î§ÔÚ1.1~3.8 eVµÄÖ±½Ó´øÏ¶¡£ÔÚx = 0.1Ï£¬KBNNOµÄ¹âµçÁ÷ÃܶȱȾµäµÄÌúµçÌå(Pb,La)(Zr,Ti)O3²ÄÁÏ´óÔ¼50±¶£¬¹âÎüÊÕÄÜÁ¦±ÈĿǰµÄÌúµçÌå²ÄÁϸß3ÖÁ6±¶¡£´Ë¹¤×÷ΪÑо¿»ùÓÚÌúµçÌå°ëµ¼ÌåµÄÌ«ÑôÄÜµç³Ø¿ª±ÙÁËÒ»ÌõÐÂ;¾¶¡£ All samples weremade by standard solid-state synthesis techniques in the powder form, followed by sintering.An integrated focused ion beamand scanning electron microscope (FEI, DB235) equipped with a lift-out tool (Omniprobe) was used to extract thin-film lamellae from the bulk-synthesized KBNNO pellets for bandgap and local ferroelectric piezoelectric switching measurements. Mesoscopic (about 20 mm thick) samples were prepared by metallization of the polished side of each pellet using thermally evaporated layers of Cr (5 nm) and Au (100 nm), followed bymounting with the pellet¡¯s metallized side face down, thinning and subsequent polishing to a root mean squared roughness of around 100 nm. Indium/tin oxide thin films (about 50 nm) were subsequently deposited onto shadow-masked, approximately 20-mm-thick KBNNO via pulsed laser deposition at 200 uCin O2. Bandgaps weremeasured by spectroscopic ellipsometry using a variable-angle spectroscopic ellipsometer equipped with Glan¨CTaylor polarizers, a rotating compensator, and deuterium and quartz halogen lamps for spectral coverage (J. A.Woollam, Model M2000). Ferroelectric switching within the lamellae was evaluated from the local piezoresponse using a scanning probe microscope (Asylum Research, MFP-3D) and Pt-coated Si probes (Olympus, AC 240TM; nominal stiffness constant, about 2Nm21). Ferroelectric polarization hysteresis measurements were collected at 77¨C200K in high vacuum (1027torr) and at ambient pressure using a ferroelectric tester (Radiant LC). Steady-state photocurrent/bias-voltage traces were collected in bulk KBNNOand BTO and in approximately 20-mm-thick films under 120-W tungsten¨Chalogen spectrally broad lamp probe illumination and using a fibre-coupled supercontinuum source (NKT Compact), under vacuum (1026 torr, Lakeshore Cryotronics, TTP4) using a picoammeter (Keithley, model 6487). Photocurrent spectra were collected using a tunable wavelength Ti:sapphire laser (M2 SolsTiS)with an incident spot diameter of about 10mm. First-principles DFT LDA1U calculations were done using normconserving pseudopotentials and a plane-wave basis set, as implemented in the Quantum-Espresso package.[ Last edited by wiseroy on 2014-1-12 at 22:57 ] |
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