Perovskite solar cells (PSCs) are displaying auspicious candidacy towards photovoltaic technology based on their features including low-cost assembling, exceptional performance, and low-temperature solution processing. However, the progression of PSCs in the direction of commercialized upgrade desires high efficiency and long-term stability. The surface and grain boundaries of perovskite layer, as well as interfaces are critical factors intended for the performance of the assembled cells. The defects mainly located in the perovskite surfaces can trigger the hysteresis, carrier recombination, and degradation, which obstacle the progress in the power conversion efficiency (PCE) of the ensuing cells. Herein, we propose to stabilize the α-FAPbI 3 perovskite phase without scarifying the spectral features by taking the benefits of 2,3,4,5,6-pentafluorobenzyl phosphonic acid (PFBPA) molecule as a passivation agent for the first time. Accordingly, high-quality PSCs with improved efficiency of 22.25% was attained with respectable cell parameters compared to the pristine cells without passivation layer. Remarkably, the PFBPA passivated ultrathin layer effectually prevents the perovskite layer from moisture, resulting in better long-term stability for unsealed PSCs maintain >90% of the original efficiency under different humidity levels (40 to 75%) after 600 h. This work finds out that the PFBPA passivation has a considerable impact in obtaining high-quality and stable FAPbI 3 films for extra beneficent both the efficiency and stability of PSCs.

Moisture-Resistant FAPbI3 Perovskite Solar Cell with 22.25 % Power Conversion Efficiency through Pentafluorobenzyl Phosphonic Acid Passivation

Inverted-structure perovskite solar cells (PVSCs) applying NiOx as the hole transport layer (HTL) have attracted increasing attention. It is still a challenge to optimize the contact between NiOx a...

Polymer Modification on the NiOx Hole Transport Layer Boosts Open-Circuit Voltage to 1.19 V for Perovskite Solar Cells.

Improving energy level alignment by adenine for efficient and stable perovskite solar cells

Review on efficiency improvement effort of perovskite solar cell

Lead halide perovskite solar cells (PSCs) have been rapidly developed in the past decade. Owing to its excellent power conversion efficiency with robust and low-cost fabrication, perovskite quickly becomes one of the most promising candidates for the next-generation photovoltaic technology. With the development of PSCs, the interface engineering has witnessed its increasingly critical role in maximizing the device performance as well as the long-term stability, because the interfaces in PSCs are closely correlated with the defect management, carrier dynamics and surface passivation. This review focuses on interfacial modification between the perovskite active layer and the charge transport layer, as well as the recent advances on high-efficiency and stable PSCs driven by interface engineering strategies. The contributing roles of interface engineering in terms of defect passivation, inhibiting ion migration, optimization of energy band alignment and morphological control are discussed. Finally, based on the latest progress and advances, strategies and opportunities for the future research on interface engineering for PSCs are proposed to promote the development of perovskite photovoltaic technology.

Recent advances on interface engineering of perovskite solar cells

NiOx-based perovskite solar cells (PSCs) have drawn tremendous attention and achieved significant improvement in recent years. Interfacial engineering is a promising route for enhancing performances of PSCs with larger open-circuit voltage (VOC) and short-circuit current density (JSC). Herein, we report a simple method for improving the performance of PSCs by applying bilateral polystyrene layers between the perovskite absorber and charge transport layers, respectively. The top and bottom surfaces of the perovskite layer are passivated and protected by ultrathin bilateral polystyrene layers, which results in highly efficient devices with a larger perovskite grain size, fewer interfacial defects and suppressed charge recombination. As a result, a power conversion efficiency (PCE) of 19.99% is achieved without hysteresis and the VOC is as high as 1.149 V, which is so far the best result for p–i–n PSCs based on pure CH3NH3PbI3. Moreover, the devices also show improved long-term stability. This study provides a powerful strategy to design and prepare highly efficient and stable perovskite solar cells.

Yulin Zhou

Papers

Highly efficient and stable perovskite solar cells via bilateral passivation layers