Overcoming C₆₀-Induced Nonradiative Recombination via Interfacial Embedding of BiOBr Flakes in Inverted Perovskite Solar Cells

Abstract

The presence of C 60 -induced nonradiative recombination tends to deteriorate the overall efficiency of inverted perovskite solar cells (PSCs). To alleviate this problem, ultrathin BiOBr flakes possessing a unique selfinduced internal electric field (SIEF) are embedded at the interface between perovskite and C 60 . SIEF, originating from the nonuniform charge distribution within the BiOBr lattice, tends to be perpendicular to the heterointerface of perovskite/ C 60 because of the designed special (001) facet. This precise arrangement facilitates electron extraction and hole blocking, yielding a field-effect mediated passivation. Also, the desired surface atomic structure on the BiOBr(001) facet can chemically passivate the perovskite surface defects via the formation of a Pb−O bond. Combining these dual passivation effects with favorable band bending, the application of BiOBr boosts the efficiency of inverted PSCs up to 24.36% with a substantially improved long-term stability. This work demonstrates an effective way to overcome efficiency and stability limits of inverted PSCs.

Strengthened cathode interface using an ultrathin 2D ferroelectric semiconductor for inverted perovskite solar cells

“…The relatively higher V bi implied an enhanced driving force for the charge extraction and collection in the completed device. 50 As a result, the photoinduced charge carriers can be maximally swept out, leading to the minimization of charge accumulation and recombination, in accordance with the observed higher average V OC and FF (Fig. S10†).…”

Halogen substitution of perinone-based cathode interfacial materials for high-efficiency inverted perovskite solar cells

“…7,8 The inverted PSCs have exhibited a boom in PCE following the introduction of self-assembled monolayers and passivation methods. 9–15…”

Portable Integrated Sensor Based on C60 Encapsulated into Cu-Based Porphyrin-Derived MOFs for the Photoelectrochemical Detection of Glyphosate

“…As a metal-free semiconductor, C 60 has attracted interest in the field of electrochemistry/photoelectrochemistry due to its abundant light absorption, delocalized conjugated structure, and properties that can serve as both electron donors and acceptors . More remarkably, C 60 can be encapsulated as guest molecules by the regular porous structure of MOFs to form host–guest nanohybrids. , It regulates the electron arrangement between the donor and acceptor through the noncovalent interactions and suppresses the recombination of photogenerated carriers to facilitate the charge transfer on the photoelectrodes. , …”