The layered, mixed-oxide hydrates, V /SUP v/ OAsO/sub 4/ . 3H/sub 2/O and V /SUP v/ OPO/sub 4/ . 2H/sub 2/O react with alkylammonium iodides to form (RNH/sub 3/) /SUB x/ V /SUB x/ /SUP 1v/ V /SUP v/ /SUB 1-x/ OAO/sub 4/ . H/sub 2/O, where R=PhCH/sub 2/, or C /SUB n/ H /SUB 2n+1/ (n=3 to 8), and x= .4 to .6 The intercalate materials exhibit a layered structure derived from the starting solids. After
层状混合氧化物水合物,V /SUP v/ OAsO/sub 4/ 。3H/sub 2/O 和 V /SUP v/ OPO/sub 4/。2H/sub 2/O 与碘化烷基铵反应形成 (RNH/sub 3/) /SUB x/ V /SUB x/ /SUP 1v/ V /SUP v/ /SUB 1-x/ OAO/sub 4/ 。H/sub 2/O,其中 R=PhCH/sub 2/,或 C /SUB n/ H /SUB 2n+1/(n=3 至 8),并且 x= .4 至 .6源自起始固体的层状结构。反应后,后者发生层状溶胀,这与烷基链的“柱状”排列一致。
Myth behind Metastable and Stable <i>n</i>-Hexylammonium Bromide-Based Low-Dimensional Perovskites
alkylammonium bromide-based low-dimensional perovskites are unclear. Herein, we investigate the physical and chemical properties of an n-hexylammonium bromide (HABr)-based low-dimensional perovskite including both thin films and single crystals. First of all, the HA2PbBr4 perovskite film and aged single crystal demonstrate different X-ray diffraction patterns from those of the fresh as-prepared single
在钙钛矿太阳能电池中,钝化含有高浓度缺陷,特别是深能级缺陷的表面或界面,是大幅提高器件功率转换效率和稳定性的最重要课题之一。长链烷基溴化铵已广泛且普遍适用于钝化处理。然而,由于这些基于烷基溴化铵的低维钙钛矿的形成途径和确切结构尚不清楚,其背后的机制仍未得到很好的探索。在此,我们研究了基于正己基溴化铵 (HABr) 的低维钙钛矿(包括薄膜和单晶)的物理和化学性质。首先,HA 2 PbBr 4钙钛矿薄膜和老化的单晶表现出与新鲜制备的单晶不同的 X 射线衍射图。我们发现新鲜的 HA 2 PbBr 4单晶呈现亚稳相,因为其结构因晶格应变的松弛而随老化而变化,而 HA 2 PbBr 4钙钛矿薄膜与老化的单晶相当稳定。在与FAPbI 3反应后,HABr可以嵌入到FAPbI 3晶格中,形成HAFAPbI 3 Br的混合阳离子钙钛矿,处于分解和生成的动态平衡。相反,HABr 与过量 PbI 2的反应形成稳定的
Controlling Phase Transitions in Two-Dimensional Perovskites through Organic Cation Alloying
作者:Rand L. Kingsford、Seth R. Jackson、Leo C. Bloxham、Connor G. Bischak
DOI:10.1021/jacs.3c02956
日期:2023.5.31
spectroscopy, we also demonstrate that the phase transition in the organic layer couples to the inorganic lattice, impacting PL intensity and wavelength. We take advantage of changes in PL intensity to image the dynamics of this phase transition and show asymmetric phase growth at the microscale. Our findings provide the necessary design principles to precisely controlphase transitions in 2D perovskites for
我们展示了通过合金化不同长度的烷基有机阳离子来控制 Ruddlesden-Popper 二维 (2D) 钙钛矿的相变温度。通过将己基铵与戊基铵或庚基铵阳离子以不同比例混合,我们连续将结晶粉末和薄膜中二维钙钛矿的相变温度从大约 40 °C 调整到 -80 °C。关联温度相关的掠入射广角 X 射线散射和光致发光光谱,我们还证明有机层中的相变与无机晶格耦合,影响 PL 强度和波长。我们利用 PL 强度的变化来成像这种相变的动力学,并在微观尺度上显示不对称相生长。
SOLAR CELL AND METHOD FOR PRODUCING SAME
申请人:Sekisui Chemical Co., Ltd.
公开号:EP3605632A1
公开(公告)日:2020-02-05
The present invention aims to provide a solar cell having high durability against deterioration due to moisture ingress from the side surfaces. The solar cell 10 of the present invention includes: first and second electrodes 12 and 17; a perovskite layer 14 provided between the first and second electrodes 12 and 17 and containing an organic-inorganic perovskite compound (A) represented by the formula RMX3 where R is an organic molecule, M is a metal atom, and X is a halogen atom; and a side-surface-protecting layer 15 provided on a peripheral side of the perovskite layer 14 to coat at least part of a side surface of the perovskite layer 14, the side-surface-protecting layer 15 containing at least one selected from the group consisting of a metal halide (B1) and an organometal halide (B2) or containing an organohalide (C).
A METHOD FOR SYNTHESIS OF ORGANIC IODIDES, A PEROVSKITE-FORMING COMPOSITION COMPRISING AN ORGANIC IODIDE AND A PHOTOVOLTAIC CELL WITH A PEROVSKITE LAYER OBTAINED THEREFROM
申请人:Saule S.A.
公开号:EP3719001A2
公开(公告)日:2020-10-07
A method for obtaining a salt with a general formula: RxNI, wherein: RxN is an organic cation (RxN+), R represents substituents (R-) independently selected from a group consisting of organic substituents: R1-, R2-, R3- and hydrogen (H-), x is a number of the substituents R- directly linked with the nitrogen (N) atom in the organic cation RxN+, wherein x is 3 or 4, I is an iodide anion (I-). The method comprises: preparing a reaction mixture comprising the steps of: synthesizing hydrogen iodide (HI) in situ by mixing molecular iodine (I2) with formic acid (COOH) in a molar ratio of molecular iodine (I2) : formic acid (COOH) of no less than 1.01:1, in a solvent medium, introducing into the solvent medium a compound being a donor of organic cation RxN+ in an amount providing the molar ratio of the donor of organic cation RxN+ : molecular iodine (I2) of no less than 1.01:1, and maintaining the reaction mixture at a temperature of not less than 20 °C for the time necessary to obtain the reaction product being the salt with the general formula RxNI. The obtained product is a substrate for synthesis of perovskites.