Low-Temperature Solution-Grown CsPbBr3 Single Crystals and Their Characterization
Low-Temperature Solution-Grown CsPbBr3 Single Crystals and Their Characterization
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DOI：
10.1021/acs.cgd.6b00764
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发表时间：
2016-10-01
影响因子：
3.8
通讯作者：
Hodes, Gary
中科院分区：
文献类型：
--
作者：
Rakita, Yevgeny;Kedem, Nir;Hodes, Gary
溴化铯铅（CsPbBr 3）最近被引入作为用于光电子学（包括光致发光）的潜在高性能薄膜卤化物钙钛矿（HaP）材料，其比MAPbBr（3）（MA = CH 3 NH3+）稳定得多。由于单晶对于研究相关材料性质本身的重要性，在与用于制备薄膜的条件相当的条件下生长的晶体，即，需要低温溶液基生长。我们在这里展示了两种简单的方法，抗溶剂蒸气饱和或加热含有逆行可溶性CsPbBr 3的溶液，从用乙腈（MeCN）或甲醇（MeOH）处理的前体溶液中生长CsPbBr 3单晶。前体溶液稳定至少数月。毫米尺寸的晶体在没有晶种的情况下生长，并且可以提供100%产率的CsPbBr 3钙钛矿晶体，避免了通常与钙钛矿相一起存在的富含CsBr（或富含PbBr 2）的组合物。进一步的增长被证明是可能的晶体播种。晶体的特点是在几个方面，包括电荷载流子寿命（30纳秒）和上限的Urbach能量（19毫电子伏）的第一个结果。由于晶体从极性非质子溶剂（DMSO）生长，其类似于用于生长杂化有机-无机HaP晶体的那些，这可以允许生长混合的（有机和无机）单价阳离子HaP晶体。
Cesium lead bromide (CsPbBr3) was recently introduced as a potentially high performance thin-film halide perovskite (HaP) material for optoelectronics, including photovoltaics, significantly more stable than MAPbBr(3) (MA = CH3NH3+). Because of the importance of single crystals to study relevant material properties per se, crystals grown under conditions comparable to those used for preparing thin films, i.e., low-temperature solution-based growth, are needed. We show here two simple ways, antisolvent-vapor saturation or heating a solution containing retrograde soluble CsPbBr3, to grow single crystals of CsPbBr3 from a precursor solution, treated with acetonitrile (MeCN) or methanol (MeOH). The precursor solutions are stable for at least several months. Millimeter-sized crystals are grown without crystal-seeding and can provide a 100% yield of CsPbBr3 perovskite crystals, avoiding a CsBr-rich (or PbBr2-rich) composition, which is often present alongside the perovskite phase. Further growth is demonstrated to be possible with crystal seeding. The crystals are characterized in several ways, including first results of charge carrier lifetime (30 ns) and an upper-limit of the Urbach energy (19 meV). As the crystals are grown from a polar aprotic solvent (DMSO), which is similar to those used to grow hybrid organic-inorganic HaP crystals, this may allow growing mixed (organic and inorganic) monovalent cation HaP crystals.