Flexibility of Semitransparent Perovskite Light-Emitting Diodes Investigated by Tensile Properties of the Perovskite Layer

Sang Yun Lee, Si Hoon Kim, Yun Seok Nam, Jae Choul Yu, Seungjin Lee, Da Bin Kim, Eui Dae Jung, Jeong Hyun Woo, Seung Min Ahn, Sukbin Lee, Kyoung Jin Choi, Ju Young Kim, Myoung Hoon Song

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Organic-inorganic hybrid perovskites have been investigated extensively for use in perovskite-based solar cells and light-emitting diodes (LEDs) because of their excellent electrical and optical properties. Although the flexibility of perovskite LEDs has been studied through empirical methods such as cyclic bending tests, the flexibility of the perovskite layer has not been investigated systemically. Here, flexible and semitransparent perovskite LEDs are fabricated: a PEDOT:PSS anode and Ag nanowire cathode allow for flexible and semitransparent devices, while the use of a conjugated polyelectrolyte as an interfacial layer reduces the electron injection barrier between the cathode and the electron transport layer (SPW-111), resulting in enhanced device efficiency. Cyclic bending tests performed on the electrodes and in situ hole-nanoindentation tests performed on the constituent materials suggest that mechanical failure occurs in the perovskite MAPbBr3 layer during cyclic bending, leading to a decrease in the luminance. Tensile properties of the MAPbBr3 layer explain the critical bending radius (rb) of the perovskite LEDs on the order of 1 mm.

Original languageEnglish
Pages (from-to)971-976
Number of pages6
JournalNano Letters
Issue number2
Publication statusPublished - 2019
Externally publishedYes


  • flexibility
  • in situ microtensile tests
  • mechanical analysis
  • Perovskite light-emitting diodes
  • semitransparent

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