基于新型配体的准二维钙钛矿太阳能电池（郗俊 JACS doi.org/10.1021/jacs.0c09647 ） - 吴朝新的个人主页空间 - 吴 朝新
基于新型配体的准二维钙钛矿太阳能电池（郗俊 JACS doi.org/10.1021/jacs.0c09647 ）
Publication Date:November 4, 2020
https://doi.org/10.1021/jacs.0c09647
Alternative organic spacers for more efficient perovskite solar cells containing Ruddlesden-Popper phases
Jun Xi†,∇,‖, Ioannis Spanopoulos¶,‖, Kijoon Bang†, Jie Xu◊, Hua Dong◊,£, Yingguo Yang^, Christos D. Malliakas¶, Justin M. Hoffman¶, Mercouri G. Kanatzidis¶*, Zhaoxin Wu◊,£*
Abstract
The halide perovskite Ruddlesden-Popper (RP) phases are a homologous layered subclass of solution processable semiconductors that have aroused great attention especially for developing long-term solar photovoltaics. They are defined as (A')2(A)n-1PbnX3n+1 (A’=spacer cation, A = cage cation, X is halide anion). The orientation control of low temperature self-assembled thin films is a fundamental issue associated with the ability to control the charge carrier transport perpendicular to the substrate. Here we report new chemical derivatives designed from a molecular perspective using a novel spacer cation 3-phenyl-2-propen ammonium (PPA) with conjugated backbone, as a low-temperature strategy to achieve more efficient devices. While forming the RP phases, multiple hydrogen bonds between PPA and inorganic octahedra reinforce the layered structure. For films we observe that as the targeted layer thickness index increases from n = 2 to n = 4, a less horizontal preferred orientation of the inorganic layers is progressively realized along with an increased presence of high-n or 3D phases, with an improved flow of free charge carriers and vertical to substrate conductivity. Accordingly, we achieve the highest efficiency of 14.76% for planar p-i-n solar cells using PPA-RP perovskites, which retain (93.8 ± 0.25)% efficiency with encapsulation after storing 600 hours at 85 °C and 85% humidity (ISOS-D-3). Our work highlights the chemical-based opportunities to address the crystal growth of RP perovskites during film deposition, underpinning the forthcoming application of low-dimensional perovskites in stable solar cells.
The halide perovskite Ruddlesden-Popper (RP) phases are a homologous layered subclass of solution processable semiconductors that have aroused great attention especially for developing long-term solar photovoltaics. They are defined as (A')2(A)n-1PbnX3n+1 (A’=spacer cation, A = cage cation, X is halide anion). The orientation control of low temperature self-assembled thin films is a fundamental issue associated with the ability to control the charge carrier transport perpendicular to the substrate. Here we report new chemical derivatives designed from a molecular perspective using a novel spacer cation 3-phenyl-2-propen ammonium (PPA) with conjugated backbone, as a low-temperature strategy to achieve more efficient devices. While forming the RP phases, multiple hydrogen bonds between PPA and inorganic octahedra reinforce the layered structure. For films we observe that as the targeted layer thickness index increases from n = 2 to n = 4, a less horizontal preferred orientation of the inorganic layers is progressively realized along with an increased presence of high-n or 3D phases, with an improved flow of free charge carriers and vertical to substrate conductivity. Accordingly, we achieve the highest efficiency of 14.76% for planar p-i-n solar cells using PPA-RP perovskites, which retain (93.8 ± 0.25)% efficiency with encapsulation after storing 600 hours at 85 °C and 85% humidity (ISOS-D-3). Our work highlights the chemical-based opportunities to address the crystal growth of RP perovskites during film deposition, underpinning the forthcoming application of low-dimensional perovskites in stable solar cells.
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