Linked Nickel Oxide/Perovskite Interface Passivation for High‐Performance Textured Monolithic Tandem Solar Cells

Abstract

Sputtered nickel oxide (NiOx) is an attractive hole‐transport layer for efficient, stable, and large‐area p‐i‐n metal‐halide perovskite solar cells (PSCs). However, surface traps and undesirable chemical reactions at the NiOx/perovskite interface are limiting the performance of NiOx‐based PSCs. To address these issues simultaneously, an efficient NiOx/perovskite interface passivation strategy by using an organometallic dye molecule (N719) is reported. This molecule concurrently passivates NiOx and perovskite surface traps, and facilitates charge transport. Consequently, the power conversion efficiency (PCE) of single‐junction p‐i‐n PSCs increases from 17.3% to 20.4% (the highest reported value for sputtered‐NiOx based PSCs). Notably, the N719 molecule self‐anchors and conformally covers NiOx films deposited on complex surfaces. This enables highly efficient textured monolithic p‐i‐n perovskite/silicon tandem solar cells, reaching PCEs up to 26.2% (23.5% without dye passivation) with a high processing yield. The N719 layer also forms a barrier that prevents undesirable chemical reactions at the NiOx/perovskite interface, significantly improving device stability. These findings provide critical insights for improved passivation of the NiOx/perovskite interface, and the fabrication of highly efficient, robust, and large‐area perovskite‐based optoelectronic devices.

Ordered Element Distributed C3N Quantum Dots Manipulated Crystallization Kinetics for 2D CsPbI3 Solar Cells with Ultra‐High Performance

“…From the electrostatic potential (ESP) map in Figure a, the PEA + shows a more significant positive charge density near the pendant ammonium, which could provide stronger intermolecular binding with the electron‐rich domains of O atoms on the surface of TiO 2 . [ 39 ] To prove this assumption, we construct the models that place a PEA + on the TiO 2 (101), disordered b‐N‐GQDs&TiO 2 (101) and ordered C 3 N QDs&TiO 2 (101) surface, respectively. The structures of ordered C 3 N QDs and disordered b‐N‐GQDs used in DFT calculation models are listed in Figures 1b,c.…”

CsPbCl3‐Cluster‐Widened Bandgap and Inhibited Phase Segregation in a Wide‐Bandgap Perovskite and its Application to NiOx‐Based Perovskite/Silicon Tandem Solar Cells

“…[14,17,24] Recent studies have aimed to mitigate this phenomenon through the use of isolating layers or eliminating Ni 3+ on the surface of the NiO x layer. For example, an isolation layer was added at the perovskite/NiO x interface to protect the perovskite layer (KCl, CsBr, and organic molecules), [12,17,24,25] while an ionic liquid was added to the perovskite precursor solution to control enrichment at the perovskite/NiO x interface, thereby preventing Ni 3+ from destroying the perovskite layer. [26] Excess formamidinium iodide (FAI) doping in the perovskite precursor solution can deplete Ni 3+ on the NiO x surface and prevent Ni 3+ from destroying the perovskite at the interface.…”

Critical Role of Removing Impurities in Nickel Oxide on High‐Efficiency and Long‐Term Stability of Inverted Perovskite Solar Cells

“…Among those, NiO x has attracted extensive attention because of its high optical transmittance, appropriate work function and inherent stability [18–22] . Currently, NiO x HTL can be produced by sputtering, electrodeposition, or pulsed laser deposition technologies [23–28] . However, these methods are stringent and costly.…”

“…[18][19][20][21][22] Currently, NiO x HTL can be produced by sputtering, electrodeposition, or pulsed laser deposition technologies. [23][24][25][26][27][28] However, these methods are stringent and costly. Therefore, as a low-cost alternative, researchers have developed a chemical precipitation method to successfully synthesize NiO x nanoparticles for the preparation of HTL, [29][30][31] but the device efficiency and stability of these NiO x -based PSCs are still lagging behind.…”