Synchronous Modulation of Defects and Buried Interfaces for Highly Efficient Inverted Perovskite Solar Cells

Abstract

Suppressing nonradiative recombination in perovskite solar cells (PSCs) is crucial for increases in their power conversion efficiency and operational stability. Here, it is reported that the synchronous use of a molecule daminozide (DA), as an interlayer and additive to judiciously construct a PTAA:F4TCNQ/DA/perovskite:DA hole‐selective heterojunction that diminishes thermionic losses for collecting holes at the buried interface between perovskites and PTAA:F4TCNQ, and reduces defect sites at such buried interfaces as well as in the perovskite film. The proposed “three birds with one stone” strategy significantly promotes charge transport, and both the interface carrier recombination and defect‐assisted recombination are suppressed. As a result, a remarkably improved efficiency of 22.15% and an impressive fill factor of 83.92% are achieved with excellent device stability compared to 19.04% of the control device. The two values are the highest records for polycrystalline MAPbI3‐based p‐i‐n structural PSCs reported to date. The work provides a promising approach of three birds with one stone, employing a functional material for further improvement of PSC performance.

Raman Spectroscopy of Formamidinium‐Based Lead Mixed‐Halide Perovskite Bulk Crystals

“…[6][7][8][9][10] A polycrystalline MAPbI 3 -based p-i-n structural photovoltaic device shows power conversion efficiencies of more than 22 %; the investigated device is (Poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine] : 2,3,5,6-Tetrafluoro7,7,8,8tetracyanoquinodimethane (PTAA : F4TCNQ)/daminozide (DA)/ perovskite : DA). [11] The high efficiency devices can be produced on cheap non-crystalline substrates by both vapor deposition and solution processing. [12,13] Despite the wide interest in LHPs, the characterization of their hybrid structures and the understanding of their chemical-physical properties are still somewhat elusive.…”

“…During the last few years, LHPs have emerged as promising materials for light emitting diodes, solar cells, transistors, lasers, and memory devices [6–10] . A polycrystalline MAPbI 3 ‐based p‐i‐n structural photovoltaic device shows power conversion efficiencies of more than 22 %; the investigated device is (Poly[bis(4‐phenyl)(2,4,6‐trimethylphenyl)amine] : 2,3,5,6‐Tetrafluoro7,7,8,8‐tetracyanoquinodimethane (PTAA : F4TCNQ)/daminozide (DA)/perovskite : DA) [11] . The high efficiency devices can be produced on cheap non‐crystalline substrates by both vapor deposition and solution processing [12,13] .…”

First-Principles Study of Group VA Monolayer Passivators for Perovskite Solar Cells

“…24,26 Similarly, Xu et al reported the successful use of daminozide as an interlayer to modify interface energetics and passivate defects at the interface as well as in perovskite bulk. 22 Although high performance of PSCs has been achieved through the trap-state passivation, the mechanism is still complicated and excellent trap-state passivators are insufficient, which require further exploration and study.…”

“…In addition, PSCs are suffering from significant non-radiative recombination losses originated from defect states of perovskites. Until now, numerous passivating strategies including solvent, composition, and interfacial engineering have been developed to enhance both efficiency and long-term stability. − Specially, the buried interface between the perovskite layer and the underlying transport layer has been vastly investigated to minimize trap states and recombination losses as well as facilitate carrier extraction. − For example, Dong et al and Gao et al have employed chlorobenzenesulfonic potassium salts and porous organic cages to passivate the buried tin oxide (SnO 2 )/perovskite interface, which results in better energy alignment, reduced trap states, and improved stability. , Similarly, Xu et al reported the successful use of daminozide as an interlayer to modify interface energetics and passivate defects at the interface as well as in perovskite bulk . Although high performance of PSCs has been achieved through the trap-state passivation, the mechanism is still complicated and excellent trap-state passivators are insufficient, which require further exploration and study.…”

Halide Substituted Ammonium Salt Optimized Buried Interface for Efficient and Stable Flexible Perovskite Solar Cells

“…As shown in Figure 7b, the 𝛼 values for two devices are almost identical, i.e., both close to 1, which suggests that the solar cells investigated in this paper are not significantly affected by space charge effects. [15,50,51] The cells based on modified buried interface indicate a smaller slope (1.37 kT q −1 ) compared with the pristine device (2.06 kT q −1 ), demonstrating a less prominent trap-assisted Shockley-Read-Hall (SRH) recombination. [52,53] In addition, the recombination lifetimes derived from transient photovoltage (TPV) decay measurements indicate a longer average carrier lifetime after the modification (8.0 s. 15.7 μs), as shown in Figure 7d.…”