Effect of Rubidium Incorporation on the Structural, Electrical, and Photovoltaic Properties of Methylammonium Lead Iodide-Based Perovskite Solar Cells
- Authors
- Park, Ik Jae; Seo, Seongrok; Park, Min Ah; Lee, Sangwook; Zhu, Kai; Shin, Hyunjung; Kim, Dong Hoe; Kim, Jin Young
- Issue Date
- Dec-2017
- Publisher
- AMER CHEMICAL SOC
- Keywords
- conductivity; methylammonium lead halides; rubidium; solar cells; trap density of states
- Citation
- ACS APPLIED MATERIALS INTERFACES, v.9, no.48, pp 41898 - 41905
- Pages
- 8
- Journal Title
- ACS APPLIED MATERIALS INTERFACES
- Volume
- 9
- Number
- 48
- Start Page
- 41898
- End Page
- 41905
- URI
- https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/146944
- DOI
- 10.1021/acsami.7b13947
- ISSN
- 1944-8244
1944-8252
- Abstract
- We report the electrical properties of rubidium-incorporated methylammonium lead iodide ((Rb(x)MA(1-x))PbI3) films and the photovoltaic performance of (Rb(x)MA(1-x))PbI3 film-based p-i-n-type perovskite solar cells (PSCs). The incorporation of a small amount of Rb+ (x = 0.05) increases both the open circuit voltage (V-oc) and the short circuit photocurrent density (J(sc)) of the PSCs, leading to an improved power conversion efficiency (PCE). However, a high fraction of Rb+ incorporation (x = 0.1 and 0.2) decreases the J(sc) and thus the PCE, which is attributed to the phase segregation of the single tetragonal perovskite phase to a MA-rich tetragonal perovskite phase and a RbPbI3 orthorhombic phase at high Rb fractions. Conductive atomic force microscopic and admittance spectroscopic analyses reveal that the single-phase (Rb(0.05)MA(0.95))PbI3 film has a high electrical conductivity because of a reduced deep-level trap density. We also found that Rb substitution enhances the diode characteristics of the PSC, as evidenced by the reduced reverse saturation current (J(0)). The optimized (Rb(x)MA(1-x))PbI3 PSCs exhibited a PCE of 18.8% with negligible hysteresis in the photocurrent-voltage curve. The results from this work enhance the understanding of the effect of Rb incorporation into organic-inorganic hybrid hali
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