Synergy of Plasmonic Silver Nanorod and Water for Enhanced Planar Perovskite Photovoltaic Devices

Abstract

Perovskite solar cells (PSCs) have been widely studied during the past 10 years. Albeit the excellent light‐absorption ability, the thickness of the perovskite layer is limited to maintain effective control over morphology and carrier migration. Meanwhile, the quality of perovskite films is a crucial factor affecting the performance of final devices. The traditional one‐step process for preparing triple‐cation perovskite films suffers from small grain size, low crystallization quality, and many surface defects. Herein, in the process of triple‐cation perovskite‐based solar cells, a facile dosing strategy of a silver nanorods (AgNR) aqueous solution into the perovskite precursor is adopted. The localized surface plasmon resonance effect of AgNR enhances the light‐capture ability of the perovskite layer without increasing the thickness. At the same time, the presence of appropriate water helps to obtain high‐quality perovskite films with larger grain size and fewer defects. It is found that the synergy of AgNR and water successfully reduces the defect density and increases mobility significantly. Consequently, a power conversion efficiency of 20.18% and a short‐circuit current (JSC) of 22.08 mA cm−2 is achieved. Meanwhile, an excellent fill factor beyond 82% is reported, which is one of the highest values for triple‐cation hybrid PSCs.

Plasmon‐Enhanced Perovskite Solar Cells with Efficiency Beyond 21 %: The Asynchronous Synergistic Effect of Water and Gold Nanorods

“…Compared with AgNR, AuNR shows better stability. [55] The slightly improved performance of the device with the AuNR aqueous solution treatment over that of the reference device manifested the benefit of trace water in ameliorating the film quality of the perovskite layer.…”

“…In our previous work, we have studied the optimal ratio of water content in the perovskite precursor solution. [55] Therefore, we directly added 2 % by volume of water and AuNR aqueous solution in the perovskite precursor solutions. It can be seen from the SEM image that the crystal cluster size of the perovskite film with water or AuNR aqueous solution (Figure 2b, c) is larger and more uniform than that of the film of the reference sample (Figure 2a), which is consistent with the previous report.…”

“…Our previous work on AgNR has discussed the effect of this effect on the increase in device recombination. [55] The addition of water improves the quality of the film and reduces the pores and defect centers at the interface between the transport layer and the perovskite, which can effectively suppress Internal recombination of carriers. The influence of AuNR on non-radiative recombination is negligible.…”

“…[30,31,[40][41][42][43][44][45][46][47][48][49]32,[50][51][52][53][54][33][34][35][36][37][38][39] In one of our preliminary works, the dosing of silver nanorods (AgNRs) aqueous solution into the perovskite with a bandgap of 1.6 eV resulted in a power conversion efficiency (PCE) of 20.18 % and well stability, which can retain 95 % of its initial PCE after storage for 20 days in an N 2 atmosphere. [55] The concerns over the long-term stability of silver in halide perovskites and the lack of study on the plasmon effect of gold nanorods (AuNRs) motivated us to use in the current work the AuNR aqueous solution to improve the performance of PSCs via an asynchronous synergistic effect (ASE) strategy. In the first step of the strategy, the water content promoted the growth of perovskite grains and the homogenization of the film morphology.…”

Polydimethylsiloxane Resin Nanocomposite Coating with Alternating Multilayer Structure for Corrosion Protection Performance

“…[1,10] Therefore, it is necessary to modify PDMS or prepare PDM S composite coating to meet the actual application requirement. As the development of nanoscience and nanotechnology, the preparative technique and applications fields [20][21][22] of nanoparticles have ach ieved remarkable progress. Nanoparticles are deemed as preferred material to enhance the anticorrosi on performance of organic coatings.…”