Simple and robust phenoxazine phosphonic acid molecules as self-assembled hole selective contacts for high-performance inverted perovskite solar cells

Abstract

For inverted perovskite solar cells (PSCs), the interfacial defect and mismatched energy level between perovskite absorber and charge selective layer restrain the further improvement of photovoltaic performance. The interfacial modification...

Stabilization of α‐phase FAPbI3 via Buffering Interfacial Region for Efficient p–i–n Perovskite Solar Cells

“…Besides, phosphonic acid groups have been previously reported to be beneficial for improving the stability and efficiency of MAPbI 3, FAPbI 3 , and triple-cation perovskite devices. [32][33][34] Halide and pseudo-halide anions, including chloride (Cl − ), [35] thiocyanate (SCN − ), [36] and formate (HCOO − ), [13] have been verified to be favorable for enhancing the crystallinity and stability of perovskite grains. Combining the phosphonic acid-based molecules with pseudo-halide anions to regulate the NiO x /FAPbI 3 interface is an efficient way to stabilize FAPbI 3 in inverted PSCs.…”

Influence of the carbazole moiety in self-assembling molecules as selective contacts in perovskite solar cells: interfacial charge transfer kinetics and solar-to-energy efficiency effects

“…Yalcin et al 15 demonstrated the inuence of the SAMs on the surface properties of indium tin oxide (ITO) and their benecial role in improving the perovskite performance. Later, other studies undertaken on SAMs, reported by our group and other authors, 10,[16][17][18][19] consider that the PCE for most of these devices relies on the molecular structure of the SAM. Therefore, the search for a suitable SAM material to increase the PCE, including reliable passivation of defects, proper alignment of the energy levels, good operating stability, and fast charge transport, is still needed.…”

Self-assembled molecules as selective contacts for efficient and stable perovskite solar cells

“…Similar functional groups were later added to SAMs by He et al , named 2BrPXZPA, with bromine-substituted phenoxazine doped with an O atom as a functional group and a butyl chain as the spacer. 38 The phenoxazine group has strong electron-donating ability, allowing it to match energy levels with the perovskite decreasing the energy loss for 2BrPXZPA-based devices. The corresponding p–i–n PSC achieved a high PCE of 22.93% (certified 22.38%), as well as good stability retaining 97% of the initial efficiency after 600 h of MPP tracking under one sun continuous illumination.…”