With recent emergence of wearable electronic devices, flexible and stretchable transparent electrodes are the core components to realize innovative devices. The copper nanowire (CuNW) network is commonly chosen because of its high conductivity and transparency. However, the junction resistances and low aspect ratios still limit its further stretchable performance. Herein, a large-scale stretchable semiembedded CuNW transparent conductive film (TCF) was fabricated by electrolessly depositing Cu on the electrospun poly(4-vinylpyridine) polymer template semiembedded in polydimethylsiloxane. Compared with traditional CuNWs, which are as-coated on the flexible substrate, the semiembedded CuNW TCFs showed low sheet resistance (15.6 Ω·sq at ∼82% transmittance) as well as outstanding stretchability and mechanical stability. The light-emitting diode connected the stretchable semiembedded CuNW TCFs in the electric circuit still lighted up even after stretching with 25% strain. Moreover, this semiembedded CuNW TCF was successfully applied in polymer solar cells as a stretchable conductive electrode, which yielded a power conversion efficiency of 4.6% with 0.1 cm effective area. The large-scale stretchable CuNW TCFs show potential for the development of wearable electronic devices.

Cerium oxide, solution processed at a low temperature (∼100 °C), was successfully employed as an electron extraction layer on top of a perovskite. The CeO layer shows good charge selectivity and increases light reflection from an Ag electrode. Besides this, the CeO layer not only protects the perovskite from water, but also acts as a dense diffusion barrier to prevent the corrosion of the metal electrode.

No abstract

Flexible transparent electrodes (FTEs) are essential sections for wearable and other flexible optoelectronic devices. The application of traditional indium tin oxide (ITO) electrodes in flexible devices is limited by its...

Quasi-2D Ruddlesden–Popper (RP) perovskite films have been widely used in fabricating high-performance perovskite light-emitting diodes (PeLEDs) and solar cells because of their environmental stability and specific optoelectronic properties. However, it is rarely reported that dual-functional light-emitting quasi-2D perovskite solar cells can be obtained with excellent performance. Herein, we demonstrated the effectiveness of MACl for modulating the phase distribution and crystal orientation. By adjusting the MACl concentration, the optimized perovskite PEA2MA2Pb3I10–x Cl x films show increased phase purity and mixed crystalline orientation consisting of in-plane and out-plane orientations. Then we demonstrated that the optimal perovskite films could realize dual-functional application with a device structure of ITO (Glass)/PEDOT:PSS/Perovskite/PCBM/PEI/Ag. When functioning as a solar cell, the optimal device shows an open voltage (V oc ) of 1.183 V and a power conversion efficiency (PCE) of 8.64%. When functioning as a LED, the optimal device exhibits a red emission at 645 nm with a maximum luminance (L max) of 1598 cd/m2 and an external quantum efficiency (EQE) of 2.2%. Our work investigates the effect of MACl on phase control toward narrow distribution and crystal orientation modulation and then demonstrates that an enhanced performance quasi-2D perovskite light-emitting solar cell can be realized with both improved charge transport and effective radiative recombination.