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物科院甘志星副教授在带隙梯度分布半导体异质结方面的研究取得重要进展

JINQI,GANZHIXINGFUJIAOSHOUZAIDAIXITIDUFENBUBANDAOTIYIZHIJIEDENENGLIANGLOUDOUXIAOYINGFANGMIANYANJIUQUDEZHONGYAOJINZHAN,FAZHANLEYIZHONGGUANGPUCESHIFANGFA,KEYIYONGYUQUFENNENGLIANGLOUDOUXIAOYINGGUOCHENGZHONGDEZAILIUZIZHUANYIHENENGLIANGGONGZHENZHUANYIJIZHI。YANJIUJIEGUOYI"Efficient Energy Funnelling by Engineering the Bandgap of a Perovskite: Förster Resonance Energy Transfer or Charge Transfer?"WEITIFABIAOYUThe Journal of Physical Chemistry Letters。The Journal of Physical Chemistry LettersSHIWULIHUAXUEYANJIULINGYUQUANWEIQIKANZHIYI,YESHIRUXUANZIRANZHISHU(Nature Index)TONGJIYUANDEQUANQIU82BENDINGJIQIKANZHIYI。

ZAIDAIXITIDUFENBUBANDAOTIYIZHIJIEZHONG,ZAILIUZISUOCHUDESHINENGHUANJINGXINGSIYIGELOUDOU,YINERHUIZIZHUDECONGKUANDAIXIDECHENGFENGUODUDAOZHAIDAIXIDECHENGFEN。LIYONGZHEIZHONGLOUDOUXIAOYINGBUJINKEYISHIXIANZAILIUZIDEDINGXIANGZHUANYI,HAIKEYIDAFUTIGAOZAILIUZIZAIBANDAOTIYIZHIJIEZHONGDEZHUANYIXIAOLV,YINCI,ZAIGUANGDIANQIJIANHENENGYUANQIJIANZHONGJUYOUZHONGYAOYINGYONGQIANJING。RANERMUQIANWEIZHI,YANJIUJIEDUIYUNENGLIANGLOUDOUXIAOYINGJIZHIDERENSHIRENGYOUJIAODADEZHENGYIHEYIWEN: NENGLIANGCONGKUANDAIXIDAOZHAIDAIXIDEGUODUSHITONGGUOZAILIUZIDEKUOSAN/PIAOYI(Charge transfer)HAISHITONGGUONENGLIANGDEGONGZHENZHUANYI(Energy transfer)SHIXIANDE?

GANZHIXINGFUJIAOSHOUJIHEZUOZHEJIASHEZAILIUZIDEKUOSAN/PIAOYISHINENGLIANGLOUDOUXIAOYINGDEZHUYAOJIZHI,TAMENCONGZAILIUZIFENBUDELIANXUXINGFANGCHENGCHUFA,FAXIANDANGLIANXU(Continuous wave)GUANGJIFAKUANDAIXICHENGFENSHI,ZAILIUZIKEYITONGGUOKUOSAN/PIAOYISHUNLIJINRUZHAIDAIXICHENGFEN,YINERKEYITONGSHITANCEDAOKUAN、ZHAILIANGZHONGDAIXIDUIYINGDEGUANGZHIFAGUANGFENG。ERJIFAGUANGYUANWEIMAICHONG(Pulsed)JIGUANGSHI,YOUYUZAILIUZIDEKUOSANZHANGDUYOUXIAN,MANZUYIDINGTIAOJIANSHI,ZAILIUZIBINGBUNENGTONGGUOKUOSAN/PIAOYIFANGSHIJINRUZHAIDAIXICHENGFEN,YINERBUNENGGUANCHADAOZHAIDAIXICHENGFENDUIYINGDEGUANGZHIFAGUANGFENG。RUGUOJIASHENENGLIANGGONGZHENZHUANYISHILOUDOUXIAOYINGDEZHUYAOJIZHISHI,ZEBULUNJIFAGUANGYUANSHILIANXUHAISHIMAICHONG,NENGLIANGGONGZHENZHUANYIZONGHUIFASHENG,ZUOWEISHOUTIDEZHAIDAIXIFAGUANGJIUZONGNENGBEITANCEDAO。GENJUYISHANGFENXI,TAMENTICHULEKEYITONGGUOBIJIAOLIANXUHEMAICHONGTIAOJIANJIFADEFAGUANGPULAIQUFENNENGLIANGLOUDOUXIAOYINGGUOCHENGZHONGDEZAILIUZIZHUANYIHENENGLIANGGONGZHENZHUANYI。

为了证实这种光谱方法的可靠性,他们利用两步化学气相沉积方法制备了在厚度方向上带隙梯度分布的钙钛矿微米片,其上表面为FAPbBr3,底部为FAPbI3,而中间层为FAPb(BrxI1x)3,对应的带隙从2.34 eV逐渐减小到1.7eV,成功获得能带结构形如漏斗的半导体异质结。这种特殊钙钛矿微米片,在脉冲激光激发时,主要可以观察到530 nm的荧光峰,说明只有表面的FAPbBr3被激发。而当激发光源为连续激光时,除了表面FAPbBr3的530 nm的荧光峰以外,底部FAPbI3对应的730 nm的荧光峰也可以观察到,说明载流子顺利地转移到了底部FAPbI3。连续和脉冲激光激发时表现出来的不同光谱特征与载流子分布连续性方程分析的结果非常吻合,说明这种钙钛矿微米片中的能量漏斗效应主要是通过电荷转移实现的。该实验也证实了比较连续和脉冲条件激发的发光谱是一种研究能量漏斗效应机制的有效方法,为设计带隙梯度分布的半导体异质结和高性能光电器件提供重要指导。

yabo登录NANJINGSHIFANDAXUEGANZHIXINGFUJIAOSHOUWEIGAILUNWENDEDIYIZUOZHEHETONGXUNZUOZHE,NANJINGSHIFANDAXUEWEIDIYIDANWEI。AODALIYASIWEIBENKEJIDAXUEJIABAOHUAJIAOSHOU、WENXIAOMINGYANJIUYUANWEILUNWENDEGONGTONGTONGXUNZUOZHE。ZHIDEYITIDESHI,GANZHIXINGFUJIAOSHOUJIHEZUOZHEZAIDAIXITIDUFENBUDEGAITAIKUANGWEIMIPIANWANCHENGLEYIXILIEDEGONGZUO[Advanced Optical Materials 2018, 6 (24), 1801107; ACS Applied Materials & Interfaces 2019, 11 (29), 26017-26023],TEBIESHIFAZHANLEYIZHONGFEIMIAOJIGUANGZHIXIEJISHUDUIZHEIZHONGTESHUDEGAITAIKUANGWEIMIPIANJINXINGJIAGONGHETUXINGHUA,ZAIWEINACHIDUSHIXIANLEDAIXIHEFAGUANGPINLVDEDIAOKONG。JIGUANGZHIXIESHIYIZHONGFEICHANGZHONGYAODEWEIJIAGONGJISHU,JUBEIJIAGONGJINGDUGAO、SUDUKUAI、CHENGBENDIDENGYOUSHI,KEYIFEICHANGLINGHUODIHUODEBUTONGDEWEINATUAN,ZAIGUANGDIANXINXIJICHENGFANGMIANYOUZHONGYAODEYINGYONGQIANJING,GAIGONGZUOWEIGAITAIKUANGDEWEINAJIAGONGTIGONGLEGENGDUOXUANZE。

XIANGGUANLIANJIE:

Z Gan*yabo登录, W Chen, C Zhou, L Yu, L Dong, B Jia*, X Wen*, Efficient Energy Funnelling by Engineering the Bandgap of a Perovskite: Förster Resonance Energy Transfer or Charge Transfer?

The Journal of Physical Chemistry Letters 2020, 11, 5963–5971.

C Zhou, G Cao,Z Gan*, Q Ou, W Chen, Q Bao, B Jia*, X Wen*, Spatially Modulating the Fluorescence Color of Mixed-Halide Perovskite Nanoplatelets through Direct Femtosecond Laser Writing. ACS Applied Materials & Interfaces 2019, 11 (29), 26017-26023.

C Zhou, Q Ou, W Chen,Z Gan, J Wang, Q Bao, X Wen*, B Jia*, Illumination‐Induced Halide Segregation in Gradient Bandgap Mixed‐Halide Perovskite Nanoplatelets, Advanced Optical Materials 2018, 6 (24), 1801107.

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