High performance planar-heterojunction perovskite solar cells using amino-based fulleropyrrolidine as the electron transporting material

Abstract

Schematic illustration of the dual function of C60–N on the perovskite layer: first, to reduce the work function of the Al electrode and second, to passivate the perovskite surface.

A Universal Strategy to Utilize Polymeric Semiconductors for Perovskite Solar Cells with Enhanced Efficiency and Longevity

“…Thus, it has been recognized that the stability of organic–inorganic hybrid perovskite materials with regard to humidity, heat, light, and oxygen should be carefully considered . Therefore, various efforts have been made to improve both efficiency and stability such as composition substitution, modification of film fabrication processing and interface engineering . Perovskite materials suffer most from a rapid degradation upon exposure to humidity, and this process also appears to be accelerated by heat.…”

Nucleation and Crystallization Control via Polyurethane to Enhance the Bendability of Perovskite Solar Cells with Excellent Device Performance

“…To obtain more direct evidence of the PU addition regulating the nucleation and crystallization of the perovskite film, the chemical properties of the perovskite film without and with PU were further investigated by X‐ray photoelectron spectroscopy (XPS) and Fourier transform infrared (FTIR) spectroscopy. The Pb 4f and I 3d XPS spectra, as shown in Figure S2 in the Supporting Information, show obvious shifts to higher binding energies for the Pb valence electrons in 4f 7/2 and 4f 5/2 for the perovskite film with PU, which directly demonstrates the existence of chemical interactions between PU and the Pb atoms . In addition, the amount of atomic I in the PU‐incorporated perovskite film is slightly greater than that of the pristine film, which did not have PbI 2 peaks in the aforementioned Xray diffraction (XRD) patterns.…”

An Amidine‐Type n‐Dopant for Solution‐Processed Field‐Effect Transistors and Perovskite Solar Cells

“…[30] To obtain more direct evidence of the passivation, X-ray photoelectron spectroscopy (XPS) was used to detect the chemical interaction between PC 61 BM or doped PC 61 BM and the under-coordinated Pb atoms on the perovskite surface. [31] The perovskite film covered with doped PC 61 BM displays a more distinct shift, indicating a more prominent passivation. [31] The perovskite film covered with doped PC 61 BM displays a more distinct shift, indicating a more prominent passivation.…”