4 years ago

Vertically Oriented 2D Layered Perovskite Solar Cells with Enhanced Efficiency and Good Stability

Vertically Oriented 2D Layered Perovskite Solar Cells with Enhanced Efficiency and Good Stability
Weifei Fu, Hongzheng Chen, Wenqing Liu, Weitao Yang, Chen Chen, Shida Yang, Xinqian Zhang, Zhongqiang Zhang, Gang Wu, Jielin Yan
Vertically oriented highly crystalline 2D layered (BA)2(MA)n−1PbnI3n+1 (BA = CH3(CH2)3NH3, MA = CH3NH3, n = 3, 4) perovskite thin-films are fabricated with the aid of ammonium thiocyanate (NH4SCN) additive through one-step spin-coating process. The humidity-stability of the film is certified by the almost unchanged X-ray diffraction patterns after exposed to humid atmosphere (Hr = 55 ± 5%) for 40 d. The photovoltaic devices with the structure of indium tin oxide(ITO)/poly(3,4-ethylenedioxythiophene):poly(styrene-sulfonate)/(BA)2(MA)n−1PbnI3n+1(n = 3,4)/[6,6]-phenyl-C61-butyric acid methyl ester/Bathocuproine/Ag are fabricated. The devices based on (BA)2(MA)2Pb3I10 perovskite (n = 3) with the precursor composition of BAI:methylammonium iodide:PbI2:NH4SCN = 2:2:3:1 (by molar ratio) show an averaged power conversion efficiency (PCE) of 6.82%. In the case of (BA)2(MA)3Pb4I13 (n = 4), a higher PCE of 8.79% is achieved. Both of the unsealed devices perform unique stability with almost unchanged PCE during the period of storage in purified N2 glove box. This work provides a simple and effective method to enhance the efficiency of the 2D perovskite solar cell. A new route to realize the vertical-orientation growth of 2D layered (BA)2(MA)n−1PbnI3n+ (n = 3, 4)-based perovskite with the aid of NH4SCN additive through one-step spin-coating method. The corresponding planar-structured solar cells present the averaged power conversion efficiency (PCE) of 6.82% (n = 3) and the best PCE of 8.79% (n = 4) with unique stability.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/smll.201700611

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