Improved Air Stability for High-Performance FACsPbI₃ Perovskite Solar Cells via Bonding Engineering

Abstract

Despite the fact that perovskite solar cells (PSCs) are widely popular due to their superb power conversion efficiency (PCE), their further applications are still restricted by low stability and high-density defects. Especially, the weak binding and ion−electron properties of perovskite crystals make them susceptible to moisture attack under environmental stress. Herein, we report an overall sulfidation strategy via introduction of 1-pentanethiol (PT) into the perovskite film to inhibit bulk defects and stabilize Pb ions. It has been confirmed that the thiol groups in PT can stabilize uncoordinated Pb ions and passivate iodine vacancy defects by forming strong Pb−S bonds, thus reducing nonradiative recombination. Moreover, the favorable passivation process also optimizes the energy-level arrangement, induces better perovskite crystallization, and enhances the charge extraction in the full solar cells. Consequently, the PT-modified inverted device delivers a champion PCE of 22.46%, which is superior to that of the control device (20.21%). More importantly, the PT-modified device retains 91.5% of its initial PCE after storage in air for 1600 h and over 85% of its initial PCE after heating at 85 °C for 800 h. This work provides a new perspective to simultaneously improve the performance and stability of PSCs to satisfy their commercial applications.

Biomaterial Improves the Stability of Perovskite Solar Cells by Passivating Defects and Inhibiting Ion Migration

“…Figure f shows the TPV measurement results. Owing to the reduction of ion defects and the loss of nonradiative recombination, the photovoltage lifetime of the passivated device is more than double that of pristine devices. , The TPC result in Figure g clearly shows the difference between both devices. The lifetime of the passivated device is 0.352 μs, while the value of the pristine device is 0.695 μs.…”

Controlling surface morphology of Ag-doped ZnO as a buffer layer by dispersion engineering in planar perovskite solar cells

“…According to the results, thiol groups in PT are capable of stabilizing uncoordinated Pb ions and passivating iodine vacancies, which reduces nonradiative recombination and improves air stability in PSCs. Accordingly, the PT-modified inverted device exhibits a PCE (%) of 22.46%, which is higher than the control device (20.21%) 18 .…”

The impact of CBz-PAI interlayer in various HTL-based flexible perovskite solar cells: A drift-diffusion numerical study

“…Moreover, in PSCs, the charge carriers (i.e., e − & h + ) transportation/collection/extraction depend on the interfaces, significantly influencing the PSC performance [ 8 ]. Therefore, interface and/or passivation engineering has recently attracted researchers [ 7 , [9] , [10] , [11] , [12] , [13] , [14] ] to resolve interface issues in PSCs.…”