Reduced Interface‐Mediated Recombination for High Open‐Circuit Voltages in CH₃NH₃PbI₃ Solar Cells

Abstract

Perovskite solar cells with all-organic transport layers exhibit efficiencies rivaling their counterparts that employ inorganic transport layers, while avoiding high-temperature processing. Herein, it is investigated how the choice of the fullerene derivative employed in the electron-transporting layer of inverted perovskite cells affects the open-circuit voltage (V ). It is shown that nonradiative recombination mediated by the electron-transporting layer is the limiting factor for the V in the cells. By inserting an ultrathin layer of an insulating polymer between the active CH NH PbI perovskite and the fullerene, an external radiative efficiency of up to 0.3%, a V as high as 1.16 V, and a power conversion efficiency of 19.4% are realized. The results show that the reduction of nonradiative recombination due to charge-blocking at the perovskite/organic interface is more important than proper level alignment in the search for ideal selective contacts toward high V and efficiency.

Rationalizing the Molecular Design of Hole‐Selective Contacts to Improve Charge Extraction in Perovskite Solar Cells

“…The more efficient in charge extraction, the more efficient in quenching of PL intensity. [34,35] The second role played by ESM/HSM has been confirmed by Stolterfoht et al [34] who compared a range of ESMs and HSMs using the TRPL and absolute PL spectra measurement.…”

Efficient Passivation of Hybrid Perovskite Solar Cells Using Organic Dyes with COOH Functional Group

“…[1][2][3][4] The highest certified power conversion efficiency (PCE) has exceeded 22% in just a few years due to a series of advanced optimizations in terms of material, [5][6][7][8] interface [9][10][11][12] and fabrication technologies. [1][2][3][4] The highest certified power conversion efficiency (PCE) has exceeded 22% in just a few years due to a series of advanced optimizations in terms of material, [5][6][7][8] interface [9][10][11][12] and fabrication technologies.…”

Supramolecular Coordination of Pb2+ Defects in Hybrid Lead Halide Perovskite Films Using Truxene Derivatives as Lewis Base Interlayers

“…[4,7,8] For instance, the use of conformally deposited Al 2 O 3 onto the nanocrystalline particles reduces the backelectron transfer to the oxidized dye but also decreases the number of defects on the TiO 2 nanocrystals surface, which act as carrier recombination centres. [2,10,11] As an example, the recent work of Di Carlo's group shows that the use of graphene oxide leads to an increase in the solar to energy conversion efficiency due to the suppression of carrier recombination centres associated to surface defects. [2,10,11] As an example, the recent work of Di Carlo's group shows that the use of graphene oxide leads to an increase in the solar to energy conversion efficiency due to the suppression of carrier recombination centres associated to surface defects.…”