Publication | Closed Access
Vertically Oriented 2D Layered Perovskite Solar Cells with Enhanced Efficiency and Good Stability
252
Citations
39
References
2017
Year
Vertically oriented highly crystalline 2D layered (BA)<sub>2</sub> (MA)<sub>n</sub><sub>-1</sub> Pb<sub>n</sub> I<sub>3</sub><sub>n</sub><sub>+1</sub> (BA = CH<sub>3</sub> (CH<sub>2</sub> )<sub>3</sub> NH<sub>3</sub> , MA = CH<sub>3</sub> NH<sub>3</sub> , n = 3, 4) perovskite thin-films are fabricated with the aid of ammonium thiocyanate (NH<sub>4</sub> SCN) 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 (H<sub>r</sub> = 55 ± 5%) for 40 d. The photovoltaic devices with the structure of indium tin oxide(ITO)/poly(3,4-ethylenedioxythiophene):poly(styrene-sulfonate)/(BA)<sub>2</sub> (MA)<sub>n</sub><sub>-1</sub> Pb<sub>n</sub> I<sub>3</sub><sub>n</sub><sub>+1</sub> (n = 3,4)/[6,6]-phenyl-C<sub>61</sub> -butyric acid methyl ester/Bathocuproine/Ag are fabricated. The devices based on (BA)<sub>2</sub> (MA)<sub>2</sub> Pb<sub>3</sub> I<sub>10</sub> perovskite (n = 3) with the precursor composition of BAI:methylammonium iodide:PbI<sub>2</sub> :NH<sub>4</sub> SCN = 2:2:3:1 (by molar ratio) show an averaged power conversion efficiency (PCE) of 6.82%. In the case of (BA)<sub>2</sub> (MA)<sub>3</sub> Pb<sub>4</sub> I<sub>13</sub> (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 N<sub>2</sub> glove box. This work provides a simple and effective method to enhance the efficiency of the 2D perovskite solar cell.
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