Improving the Performance of Perovskite Solar Cells using a Polyphosphazene Interfacing Layer

• DOI: 10.1002/pssa.201900436
• Publication Date: 2019-07-04T13:01:15Z
• Authors: Bekele Hailegnaw; Vanessa Poscher; Christoph Ulbricht; Hathaichanok Seel...; Ian Teasdale; Yolanda Salinas; Niyazi Serdar Sar...; Markus Clark Scha...
• Keywords: Polyphosphazene

Herein, the impact of thin layer polyphosphazene derivatives, as a buffer between electron‐transporting and back metal‐contact in mixed‐cation mixed‐halide perovskite solar cells (PSCs), is explored. PSCs with poly[bis(allylamino)phosphazene] (PPz) interlayer exhibit enhanced rectification photo‐induced current density–voltage ( J–V ) curves, which show improved photovoltaic performance photostability reduced hysteresis. The thickness optimized PPz shows an average open‐circuit voltage V OC ≈1.05 V, short‐circuit density J SC around 23.5 mA cm −2 , fill factor ≈72%, power conversion efficiency about 17.3% for forward reverse scans under simulated AM1.5G illumination. Moreover, application organic reveals that interfacial improves electron extraction at cathode. merit applying extends to possibility using different metals (such aluminum, gold, copper, silver) top contact prepared PCSs. In general, these experiments reveal very promising approach tackle issue interfacing, improve stability PSCs.