In situ dipole formation to achieve high open-circuit voltage in inverted perovskite solar cells via fluorinated pseudohalide engineering

Abstract

EMIMTFSI can significantly lower the nonradiative recombination loss in p–i–n perovskite solar cells to achieve a champion power conversion efficiency of 24.81% with an impressive open-circuit voltage of 1.191 V.

Preventing lead leakage in perovskite solar cells and modules with a low-cost and stable chemisorption coating

“…Metal halide perovskite solar cells (PSCs) have emerged as a captivating focus of research within the realm of photovoltaics 1–11 and experienced a commendable advancement in photovoltaic conversion efficiency, soaring from an initial 3.8% to a remarkable 26.14%. 12 Moreover, commendable strides have been made in the fabrication of large-area PSCs, 13–15 bolstering their potential for promising commercialization and applications in diverse fields.…”

Impact of Dipole Effect on Perovskite Solar Cells

“…Moreover, the directional dipole improves the local dielectric environment, thereby reducing the exciton binding energy and improve charge transport speed, greatly prolonging the carrier lifetime. Chen et al [134] doped the fluorinated pseudohalide ionic liquid (FPH-IL) 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMIMTFSI) into the perovskite phase. During the crystallization process of perovskite, EMIMTF-SI can accumulate and form an interface dipole layer at the top of the perovskite, significantly reducing exciton binding energy and nonradiative recombination, achieving a high V OC of 1.19 V for inverted devices.…”

“…Moreover, the directional dipole improves the local dielectric environment, thereby reducing the exciton binding energy and improve charge transport speed, greatly prolonging the carrier lifetime. Chen et al [134] . doped the fluorinated pseudohalide ionic liquid (FPH‐IL) 1‐ethyl‐3‐methylimidazolium bis(trifluoromethylsulfonyl)imide (EMIMTFSI) into the perovskite phase.…”

Molecular Engineering of 2D Spacer Cations to Achieve Efficient and Stable 2D/3D Perovskite Solar Cells

“…The large dipole moment and stronger binding energy of 3‐TFPMAI may be beneficial to obtain the film with uniform morphology and improve carrier transport at the interface. [ 26,27 ] Experimental results indicated that the 3‐TFPMAI‐based 2D/3D perovskite film showed a smoother surface with fewer defects. In addition, 3‐TFPMAI modification can also adjust the energy level, thus accelerating the hole extraction and hole transporting.…”