Highly Efficient Flexible Perovskite Light-Emitting Diodes Using the Modified PEDOT:PSS Hole Transport Layer and Polymer–Silver Nanowire Composite Electrode

Metal
halide perovskites have been actively studied as promising
materials in optoelectronic devices because of their superior optical
and electrical properties and have also shown considerable potential
for flexible devices because of their good mechanical properties.
However, the large hole injection barrier and exciton quenching between
the perovskite emitter and poly­(3,4-ethylenedioxythiophene):poly-styrene
sulfonate (PEDOT:PSS) can lead to the reduction in device efficiency.
Here, a nonconductive fluorosurfactant, Zonyl FS-300 (Zonyl), is introduced
into the PEDOT:PSS hole transport layer, which reduces the hole injection
barrier and exciton quenching at the PEDOT:PSS/perovskite interface.
Moreover, a flexible perovskite light-emitting diode with a polymer–silver
nanowire composite electrode is demonstrated, showing a maximum current
efficiency (CEmax) of 17.90 cd A–1, and
this is maintained even after 1000 cycles of bending with a 2.5 mm
bending radius.

金属卤化物钙钛矿（metal halide perovskites）凭借优异的光电性能，已被广泛研究为光电器件领域极具应用前景的材料；同时其良好的机械性能也使其在柔性器件领域展现出可观的应用潜力。然而，钙钛矿发射层与聚(3,4-乙撑二氧噻吩):聚苯乙烯磺酸盐（PEDOT:PSS）之间存在较大的空穴注入势垒与激子猝灭问题，会导致器件效率降低。本研究将非导电氟表面活性剂Zonyl FS-300（简称Zonyl）引入PEDOT:PSS空穴传输层中，可降低PEDOT:PSS/钙钛矿界面处的空穴注入势垒与激子猝灭效应。此外，本研究还制备了搭载聚合物-银纳米线复合电极的柔性钙钛矿发光二极管，其最大电流效率（CEmax）可达17.90 cd·A⁻¹，且在弯曲半径为2.5 mm的条件下经过1000次弯曲循环后，该性能仍得以保持。