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Compared with traditional inorganic ferroelectric materials, organic molecular ferroelectric materials possess many advantages, such as light weight, flexibility, no heavy metal atoms and low cost, and have received extensive attention for a long time. In recent years, atomic-thick two-dimensional (2D) inorganic ferroelectric materials have achieved breakthrough and attracted much attention. However, there are few reports on the design and research of two-dimensional organic ferroelectric materials. In this paper, we theoretically propose a 2D monolayer organic ferroelectric molecular crystal with the cyclobutene-1,2-dicarboxylic acid (CBDC) molecules as the building block based on density functional theory calculations. The bulk of CBDC molecular crystals clearly shows layered structure due to the chain-like arrangement of hydrogen bonds in crystal. It is found that the internal hydrogen bond chains give rise to the anisotropic cleavage energy values along different crystal planes of the CBDC molecular crystal bulk. Theoretical calculation suggests that the CBDC based 2D monolayer organic ferroelectric molecular crystal can be achieved by the mechanical/chemical peeling along the (102) crystal plane because of the lowest cleavage energy. It is predicted that the in-plane spontaneous polarization of the CBDC (102) molecular crystal monolayer is ~0.39 × 10–6 μC/cm, which is comparable to those of some inorganic counterparts. Calculations also indicate that the CBDC (102) molecular crystal monolayer shows a high polarization reversal barrier and is sensitive to the external uniaxial stress. The CBDC (102) monolayer organic ferroelectric molecular crystal reveals high in-plane spontaneous polarization with polarization reversal barrier easily modulated by the interface strain engineering, thereby rendering it great potential in lightweight, metal-free and flexible ferroelectric devices.
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Keywords:
- two-dimensional molecular crystal /
- organic ferroelectric /
- in-plane polarization /
- polarization reversal
[1] Novoselov K S, Geim A K, Morozov S V, Jiang D, Zhang Y, Dubonos S V, Grigorieva I V, Firsov A A 2004 Science 306 666Google Scholar
[2] Radisavljevic B, Radenovic A, Brivio J, Giacometti V, Kis A 2011 Nat. Nanotechnol. 6 147Google Scholar
[3] Lopez-Sanchez O, Lembke D, Kayci M, Radenovic A, Kis A 2013 Nat. Nanotechnol. 8 497Google Scholar
[4] Zeng H, Dai J, Yao W, Xiao D, Cui X 2012 Nat. Nanotechnol. 7 490Google Scholar
[5] Cong C, Shang J, Wu X, Cao B, Peimyoo N, Qiu C, Sun L, Yu T 2014 Adv. Opt. Mater. 2 131Google Scholar
[6] Bertolazzi S, Brivio J, Kis A 2011 ACS Nano 5 9703Google Scholar
[7] Cai Y, Lan J, Zhang G, Zhang Y W 2014 Phys. Rev. B 89 035438Google Scholar
[8] Profeta G, Calandra M, Mauri F 2012 Nat. Phys. 8 131Google Scholar
[9] Zhou J J, Feng W, Liu C C, Guan S, Yao Y 2014 Nano Lett. 14 4767Google Scholar
[10] Li X, Yang J 2014 J. Mater. Chem. C 8 8098Google Scholar
[11] Belianinov A, He Q, Dziaugys A, Maksymovych P, Eliseev E, Borisevich A, Morozovska A, Banys J, Vysochanskii Y, Kalinin S V 2015 Nano Lett. 15 3808Google Scholar
[12] Bune A V, Fridkin V M, Ducharme S, Blinov L M, Palto S P, Sorokin A V, Yudin S G, Zlatkin A 1998 Nature 391 874Google Scholar
[13] Blinov L M, Fridkin V M, Palto S P, Bune A V, Dowben P A, Ducharme S 2000 Phys. Usp. 43 243Google Scholar
[14] Mehta R R, Silverman B D, Jacobs J T 1973 J. Appl. Phys. 44 3379Google Scholar
[15] Fong D D, Stephenson G B, Streiffer S K, Eastman J A, Auciello O, Fuoss P H, Thompson C 2004 Science 304 1650Google Scholar
[16] Gruverman A, Wu D, Lu H, Wang Y, Jang H W, Folkman C M, Zhuravlev M Y, Felker D, Rzchowski M, Eom C B, Tsymbal E Y 2009 Nano Lett. 9 3539Google Scholar
[17] Jin Hu W, Wang Z, Yu W, Wu T 2016 Nat. Commun. 7 10808Google Scholar
[18] Wang H, Liu Z R, Yoong H Y, Paudel T R, Xiao J X, Guo R, Lin W N, Yang P, Wang J, Chow G M, Venkatesan T, Tsymbal E Y, Tian H, Chen J S 2018 Nat. Commun. 9 3319Google Scholar
[19] Chang K, Liu J, Lin H, Wang N, Zhao K, Zhang A, Jin F, Zhong Y, Hu X, Duan W, Zhang Q, Fu L, Xue Q K, Chen X, Ji S H 2016 Science 353 274Google Scholar
[20] Yang Q, Wu M, Li J 2018 J. Phys. Chem. Lett. 9 7160Google Scholar
[21] Fei R, Kang W, Yang L 2016 Phys. Rev. Lett. 117 097601Google Scholar
[22] Wu M, Zeng X C 2016 Nano Lett. 16 3236Google Scholar
[23] Liu C, Wan W, Ma J, Guo W, Yao Y 2018 Nanoscale 10 7984Google Scholar
[24] Liu F, You L, Seyler K L, Li X, Yu P, Lin J, Wang X, Zhou J, Wang H, He H, Pantelides S T, Zhou W, Sharma P, Xu X, Ajayan P M, Wang J, Liu Z 2016 Nat. Commun. 7 12357Google Scholar
[25] Xu B, Xiang H, Xia Y, Jiang K, Wan X, He J, Yin J, Liu Z 2017 Nanoscale 9 8427Google Scholar
[26] Reimers J R, Tawfik S A, Ford M J 2018 Chem. Sci. 9 7620Google Scholar
[27] Lai Y, Song Z, Wan Y, Xue M, Wang C, Ye Y, Dai L, Zhang Z, Yang W, Du H, Yang J 2019 Nanoscale 11 5163Google Scholar
[28] Ding W, Zhu J, Wang Z, Gao Y, Xiao D, Gu Y, Zhang Z, Zhu W 2017 Nat. Commun. 8 14956Google Scholar
[29] Cui C, Hu W J, Yan X, Addiego C, Gao W, Wang Y, Wang Z, Li L, Cheng Y, Li P, Zhang X, Alshareef H N, Wu T, Zhu W, Pan X, Li L J 2018 Nano Lett. 18 1253Google Scholar
[30] Wu M, Zeng X C 2017 Nano Lett. 17 6309Google Scholar
[31] Ren Y, Dong S, Wu M 2018 ACS Appl. Mater. Interfaces 10 35361Google Scholar
[32] Wu M, Duan T, Lu C, Fu H, Dong S, Liu J 2018 Nanoscale 10 9509Google Scholar
[33] Valasek J 1921 Phys. Rev. 17 475Google Scholar
[34] Furukawa T 1989 Phase Transitions 18 143Google Scholar
[35] Naber R C, Asadi K, Blom P W, de Leeuw D M, de Boer B 2010 Adv. Mater. 22 933Google Scholar
[36] Heremans P, Gelinck G H, Muller R, Baeg K J, Kim D Y, Noh Y Y 2011 Chem. Mater. 23 341Google Scholar
[37] Tang Y Y, Li P F, Zhang W Y, Ye H Y, You Y M, Xiong R G 2017 J. Am. Chem. Soc. 139 13903Google Scholar
[38] Yang Q, Xiong W, Zhu L, Gao G, Wu M 2017 J. Am. Chem. Soc. 139 11506Google Scholar
[39] Yang C K, Chen W N, Ding Y T, Wang J, Rao Y, Liao W Q, Tang Y Y, Li P F, Wang Z X, Xiong R G 2019 Adv. Mater. 3 1Google Scholar
[40] Shi P P, Lu S Q, Song X J, Chen X G, Liao W Q, Li P F, Tang Y Y, Xiong R G 2019 J. Am. Chem. Soc. 141 18334Google Scholar
[41] Ma L, Jia Y, Ducharme S, Wang J, Zeng X C 2019 J. Am. Chem. Soc. 141 1452Google Scholar
[42] Kresse G, Furthmuller J 1996 Phys. Rev. B 54 11169Google Scholar
[43] Perdew J P, Yue W 1986 Phys. Rev. B 33 8800Google Scholar
[44] Perdew J P, Burke K, Ernzerhof M 1996 Phys. Rev. Lett. 77 3865Google Scholar
[45] Blochl P E 1994 Phys. Rev. B 50 17953Google Scholar
[46] Grimme S, Antony J, Ehrlich S, Krieg H 2010 J. Chem. Phys. 132 154104Google Scholar
[47] Monkhorst H J, Pack J D 1976 Phys. Rev. B 13 5188Google Scholar
[48] King-Smith R D, Vanderbilt D 1993 Phys. Rev. B. 47 1651Google Scholar
[49] Horiuchi S, Tokunaga Y, Giovannetti G, Picozzi S, Itoh H, Shimano R, Kumai R, Tokura Y 2010 Nature 463 789Google Scholar
[50] Horiuchi S, Kumai R, Tokura Y 2011 Adv. Mater. 23 2098Google Scholar
[51] Horiuchi S, Kagawa F, Hatahara K, Kobayashi K, Kumai R, Murakami Y, Tokura Y 2012 Nat. Commun. 3 1308Google Scholar
[52] Horiuchi S, Kobayashi K, Kumai R, Ishibashi S 2017 Nat. Commun. 8 14426Google Scholar
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图 1 优化后的CBDC分子晶体结构图示 (a) CBDC块体的斜视图; (b)—(d)分别为晶胞沿a, b, c基矢方向的视图. 图中灰色、白色和红色小球分别指代碳原子、氢原子和氧原子
Figure 1. Optimized structure of bulk of CBDC molecular crystal: (a) Perspective view of bulk CBDC; (b)–(d) view of bulk CBDC along a, b and c axis, respectively. The gray, white and red balls denote C, H and O atoms, respectively.
图 2 优化后的块体3-HPLN分子沿晶胞不同基矢方向的晶体结构视图 (a) 基矢a方向; (b) 基矢b方向; (c) 基矢c方向. 图中灰色、乳白色和红色小球分别指代碳原子、氢原子和氧原子
Figure 2. View of optimized structure of bulk 3-HPLN molecular crystal along different axes: (a) Along a axis; (b) along b axis; (c) along c axis. The gray, milk white and red balls denote C, H and O atoms, respectively.
图 3 优化后的块体PhMDA分子沿晶胞不同基矢方向的晶体结构视图 (a) 基矢a方向; (b) 基矢b方向; (c) 基矢c方向. 图中灰色、乳白色和红色小球分别指代碳原子、氢原子和氧原子
Figure 3. View of optimized structure of bulk PhMDA molecular crystal along different axes:. (a) Along a axis; (b) along b axis; (c) along c axis. The gray, milk white and red balls denote C, H and O atoms respectively.
图 4 CBDC晶体的铁电机制. 图中绿色圆圈标注了氢键的位置, 其中质子的集体迁移导致了铁电极化由晶格
$[20\bar{1}]$ 方向转为$ [\bar{2}01] $ 方向; 灰色、乳白色和红色小球分别指代碳原子、氢原子和氧原子Figure 4. Ferroelectric mechanism of CBDC crystal. Green circles mark the collective transfer of protons within the hydrogen bonds, leading to the orientation of polarity being reversed from
$ [20\bar{1}] $ direction to$ [\bar{2}01] $ direction. The gray, milk white and red balls denote C, H and O atoms, respectively.图 5 CBDC分子晶体块体沿(102)晶面的剥离示意图. 其中左图中黄色平面代表(102)密勒晶面, 右图为(102)单层的顶视图. 灰色乳白色和红色小球分别指代碳原子、氢原子和氧原子.
Figure 5. Exfoliation of CBDC bulk crystal along the (102) Millar plane. The yellow plane in left panel denotes the (102) plane. The right panel is the top view of the single-unit-thick (102) plane. The gray, white and red balls denote C, H and O atoms respectively.
图 7 (a) 顺电相下的CBDC (102), 绿色圆圈中质子处于相邻两个氧原子中间处; (b) 顺电相下的CBDC (102)中的CBDC分子结构示意图, 黄色平面为分子的对称面
Figure 7. (a) Paraelectric phase of CBDC (102) monolayer crystal, the protons in green circles are located at the center of the adjacent oxygen atoms; (b) CBDC molecular in paraelectric phase, the yellow plane denotes symmetry plane of the molecular.
图 14 石墨烯基底上的CBDC (102)单层分子晶体经过5 ps从头算分子动力学模拟后的结构图(NPT系综, 温度300 K, 时间步长1 fs) (a) 正视图; (b) 侧视图. 图(a)中绿色曲线指示了多条有序排列的氢键链, 为清晰起见, 图(a)中的石墨烯衬底已被隐去
Figure 14. (a) Top and (b) side views of snapshot of the two-dimensional CBDC (102) monolayer supported on a graphene sheet, after 5 ps of AIMD simulation. The substrate in panel (a) is removed for clarity.
表 1 铁电相CBDC分子晶体的自发极化
Table 1. Spontaneous polarization of ferroelectric phase of CBDC molecular crystal.
Polarization/(μC·cm–2) a b c Exp. 8.6 0 10 DFT (Horiuchi[52]) 11.7 0 9.6 DFT (Our work) 11.7 0 9.5 表 2 CBDC (102)的晶格参数以及自发铁电极化值
Table 2. Lattice parameters and spontaneous ferroelectric polarization of CBDC (102).
a/Å b/Å γ/(°) Ps/(10–6 μC·cm–1) CBDC (102) 14.92 13.56 90 0.39 -
[1] Novoselov K S, Geim A K, Morozov S V, Jiang D, Zhang Y, Dubonos S V, Grigorieva I V, Firsov A A 2004 Science 306 666Google Scholar
[2] Radisavljevic B, Radenovic A, Brivio J, Giacometti V, Kis A 2011 Nat. Nanotechnol. 6 147Google Scholar
[3] Lopez-Sanchez O, Lembke D, Kayci M, Radenovic A, Kis A 2013 Nat. Nanotechnol. 8 497Google Scholar
[4] Zeng H, Dai J, Yao W, Xiao D, Cui X 2012 Nat. Nanotechnol. 7 490Google Scholar
[5] Cong C, Shang J, Wu X, Cao B, Peimyoo N, Qiu C, Sun L, Yu T 2014 Adv. Opt. Mater. 2 131Google Scholar
[6] Bertolazzi S, Brivio J, Kis A 2011 ACS Nano 5 9703Google Scholar
[7] Cai Y, Lan J, Zhang G, Zhang Y W 2014 Phys. Rev. B 89 035438Google Scholar
[8] Profeta G, Calandra M, Mauri F 2012 Nat. Phys. 8 131Google Scholar
[9] Zhou J J, Feng W, Liu C C, Guan S, Yao Y 2014 Nano Lett. 14 4767Google Scholar
[10] Li X, Yang J 2014 J. Mater. Chem. C 8 8098Google Scholar
[11] Belianinov A, He Q, Dziaugys A, Maksymovych P, Eliseev E, Borisevich A, Morozovska A, Banys J, Vysochanskii Y, Kalinin S V 2015 Nano Lett. 15 3808Google Scholar
[12] Bune A V, Fridkin V M, Ducharme S, Blinov L M, Palto S P, Sorokin A V, Yudin S G, Zlatkin A 1998 Nature 391 874Google Scholar
[13] Blinov L M, Fridkin V M, Palto S P, Bune A V, Dowben P A, Ducharme S 2000 Phys. Usp. 43 243Google Scholar
[14] Mehta R R, Silverman B D, Jacobs J T 1973 J. Appl. Phys. 44 3379Google Scholar
[15] Fong D D, Stephenson G B, Streiffer S K, Eastman J A, Auciello O, Fuoss P H, Thompson C 2004 Science 304 1650Google Scholar
[16] Gruverman A, Wu D, Lu H, Wang Y, Jang H W, Folkman C M, Zhuravlev M Y, Felker D, Rzchowski M, Eom C B, Tsymbal E Y 2009 Nano Lett. 9 3539Google Scholar
[17] Jin Hu W, Wang Z, Yu W, Wu T 2016 Nat. Commun. 7 10808Google Scholar
[18] Wang H, Liu Z R, Yoong H Y, Paudel T R, Xiao J X, Guo R, Lin W N, Yang P, Wang J, Chow G M, Venkatesan T, Tsymbal E Y, Tian H, Chen J S 2018 Nat. Commun. 9 3319Google Scholar
[19] Chang K, Liu J, Lin H, Wang N, Zhao K, Zhang A, Jin F, Zhong Y, Hu X, Duan W, Zhang Q, Fu L, Xue Q K, Chen X, Ji S H 2016 Science 353 274Google Scholar
[20] Yang Q, Wu M, Li J 2018 J. Phys. Chem. Lett. 9 7160Google Scholar
[21] Fei R, Kang W, Yang L 2016 Phys. Rev. Lett. 117 097601Google Scholar
[22] Wu M, Zeng X C 2016 Nano Lett. 16 3236Google Scholar
[23] Liu C, Wan W, Ma J, Guo W, Yao Y 2018 Nanoscale 10 7984Google Scholar
[24] Liu F, You L, Seyler K L, Li X, Yu P, Lin J, Wang X, Zhou J, Wang H, He H, Pantelides S T, Zhou W, Sharma P, Xu X, Ajayan P M, Wang J, Liu Z 2016 Nat. Commun. 7 12357Google Scholar
[25] Xu B, Xiang H, Xia Y, Jiang K, Wan X, He J, Yin J, Liu Z 2017 Nanoscale 9 8427Google Scholar
[26] Reimers J R, Tawfik S A, Ford M J 2018 Chem. Sci. 9 7620Google Scholar
[27] Lai Y, Song Z, Wan Y, Xue M, Wang C, Ye Y, Dai L, Zhang Z, Yang W, Du H, Yang J 2019 Nanoscale 11 5163Google Scholar
[28] Ding W, Zhu J, Wang Z, Gao Y, Xiao D, Gu Y, Zhang Z, Zhu W 2017 Nat. Commun. 8 14956Google Scholar
[29] Cui C, Hu W J, Yan X, Addiego C, Gao W, Wang Y, Wang Z, Li L, Cheng Y, Li P, Zhang X, Alshareef H N, Wu T, Zhu W, Pan X, Li L J 2018 Nano Lett. 18 1253Google Scholar
[30] Wu M, Zeng X C 2017 Nano Lett. 17 6309Google Scholar
[31] Ren Y, Dong S, Wu M 2018 ACS Appl. Mater. Interfaces 10 35361Google Scholar
[32] Wu M, Duan T, Lu C, Fu H, Dong S, Liu J 2018 Nanoscale 10 9509Google Scholar
[33] Valasek J 1921 Phys. Rev. 17 475Google Scholar
[34] Furukawa T 1989 Phase Transitions 18 143Google Scholar
[35] Naber R C, Asadi K, Blom P W, de Leeuw D M, de Boer B 2010 Adv. Mater. 22 933Google Scholar
[36] Heremans P, Gelinck G H, Muller R, Baeg K J, Kim D Y, Noh Y Y 2011 Chem. Mater. 23 341Google Scholar
[37] Tang Y Y, Li P F, Zhang W Y, Ye H Y, You Y M, Xiong R G 2017 J. Am. Chem. Soc. 139 13903Google Scholar
[38] Yang Q, Xiong W, Zhu L, Gao G, Wu M 2017 J. Am. Chem. Soc. 139 11506Google Scholar
[39] Yang C K, Chen W N, Ding Y T, Wang J, Rao Y, Liao W Q, Tang Y Y, Li P F, Wang Z X, Xiong R G 2019 Adv. Mater. 3 1Google Scholar
[40] Shi P P, Lu S Q, Song X J, Chen X G, Liao W Q, Li P F, Tang Y Y, Xiong R G 2019 J. Am. Chem. Soc. 141 18334Google Scholar
[41] Ma L, Jia Y, Ducharme S, Wang J, Zeng X C 2019 J. Am. Chem. Soc. 141 1452Google Scholar
[42] Kresse G, Furthmuller J 1996 Phys. Rev. B 54 11169Google Scholar
[43] Perdew J P, Yue W 1986 Phys. Rev. B 33 8800Google Scholar
[44] Perdew J P, Burke K, Ernzerhof M 1996 Phys. Rev. Lett. 77 3865Google Scholar
[45] Blochl P E 1994 Phys. Rev. B 50 17953Google Scholar
[46] Grimme S, Antony J, Ehrlich S, Krieg H 2010 J. Chem. Phys. 132 154104Google Scholar
[47] Monkhorst H J, Pack J D 1976 Phys. Rev. B 13 5188Google Scholar
[48] King-Smith R D, Vanderbilt D 1993 Phys. Rev. B. 47 1651Google Scholar
[49] Horiuchi S, Tokunaga Y, Giovannetti G, Picozzi S, Itoh H, Shimano R, Kumai R, Tokura Y 2010 Nature 463 789Google Scholar
[50] Horiuchi S, Kumai R, Tokura Y 2011 Adv. Mater. 23 2098Google Scholar
[51] Horiuchi S, Kagawa F, Hatahara K, Kobayashi K, Kumai R, Murakami Y, Tokura Y 2012 Nat. Commun. 3 1308Google Scholar
[52] Horiuchi S, Kobayashi K, Kumai R, Ishibashi S 2017 Nat. Commun. 8 14426Google Scholar
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