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Coordination polymer based perovskite device: matched energy levels and photocurrent enhancement in the absence or presence of methanol
CrystEngComm ( IF 3.1 ) Pub Date : 2017-11-06 00:00:00 , DOI: 10.1039/c7ce01682d
Sen Lv 1, 2, 3, 4, 5 , Zhe Yuan Wang 1, 2, 3, 4, 5 , Xu Gu 1, 2, 3, 4, 5 , Chong Zhang 1, 2, 3, 4, 5 , Yun Gong 1, 2, 3, 4, 5 , Jian Hua Lin 1, 2, 3, 4, 5
Affiliation  

Using 3,6,3′-biphenyltricarboxylic acid (H3L1) and N1,N4-di(pyridin-4-yl)terephthalamide (L), two coordination polymers (CPs) formulated as Co3L2(L1)2(H2O)8·3H2O (1) and ZnL0.5(HL1)(H2O)·2H2O (2) have been hydrothermally synthesized and structurally characterized by single-crystal X-ray diffraction. CP 2 exhibits a uninodal 3-connected two-dimensional (2D) framework with {63}-hcb topology and DFT calculation reveals that it is a semiconductor. CP 2 shows photocurrent response under visible light illumination (650 nm > λ > 350 nm). Based on CP 2, a device based on FTO/TiO2/perovskite CH3NH3PbI3/CP 2 was constructed, which yielded a much larger photocurrent density than CP 2 in aqueous electrolyte solution under visible light illumination (650 nm > λ > 350 nm), and it is ascribed to the matched valence-band maximum (VBM) and conduction-band minimum (CBM) energy levels of CP 2 and CH3NH3PbI3. In the presence of methanol, the photocurrent response generated on the device can be remarkably improved, which is due to the photoinduced holes captured by methanol, leading to the more efficient separation of the photoinduced electrons and holes.

中文翻译:

基于配位聚合物的钙钛矿装置:在不存在或存在甲醇的情况下,能级匹配且能提高光电流

使用3,6,3'-联苯三羧酸(H 3 L1)和N 1N 4-二(吡啶-4-基)对苯二甲酰胺(L),将两种配位聚合物(CP)配制成Co 3 L 2L1)水热合成了2(H 2 O)8 ·3H 2 O(1)和ZnL 0.5HL1)(H 2 O)·2H 2 O(2),并通过单晶X射线衍射对其结构进行了表征。CP 2展示了具有{6 3 } -hcb拓扑的单节点3连通二维(2D)框架,DFT计算表明它是半导体。CP 2显示了在可见光照明(650 nm> λ > 350 nm)下的光电流响应。基于CP 2,构建了基于FTO / TiO 2 /钙钛矿CH 3 NH 3 PbI 3 / CP 2的装置,在可见光照射下(650 nm> λ),在电解质水溶液中产生的光电流密度比CP 2大得多。> 350 nm),并且归因于CP 2和CH 3 NH 3 PbI 3的匹配的价带最大(VBM)和导带最小(CBM)能级。在存在甲醇的情况下,由于由甲醇捕获的光致空穴,可以显着改善在器件上产生的光电流响应,从而导致光致电子和空穴的更有效分离。
更新日期:2017-11-13
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