Method for preparing efficient and stable light-emitting solar concentrator by passivating perovskite thin film through multifunctional molecular additive

Abstract

The invention relates to a method for preparing an efficient and stable solar concentrator by passivating a perovskite thin film through a multifunctional molecular additive, belongs to the field of building integrated photovoltaics, and solves the problems of low light conversion efficiency and poor environmental stability. The perovskite nanocrystals are effectively passivated and non-radiative recombination centers are greatly reduced through the octyl triphenyl phosphonium bromide multifunctional molecules, the photoluminescence quantum yield and the long-term environmental stability of the perovskite thin film are remarkably improved, and the luminescent solar concentrator with high light conversion efficiency and long-term environmental stability is successfully realized. The invention provides a manufacturing and practical application scheme of a low-cost perovskite light-emitting solar concentrator, and aims to meet the increasing requirements of renewable energy sources and make contributions to green technology and sustainable development.

Description

Technical Field The invention belongs to the field of photovoltaic building integration and relates to a method for preparing a highly efficient and stable solar concentrator by passivating a perovskite film with a multifunctional molecular additive. Background Art

[0002] Luminescent solar concentrators (LSCs), as large-area solar-harvesting devices that convert sunlight into electricity, offer a viable strategy for meeting the growing demand for renewable energy. Compared to single silicon photovoltaic devices, LSCs can be widely integrated into transparent architectural windows, significantly improving solar energy utilization and reducing electricity costs. Quasi-two-dimensional perovskites, with their multiple quantum well structures, offer large Stokes shifts and efficient photoluminescence, which hold great potential for LSC applications. However, their low photoelectric conversion efficiency and poor stability remain obstacles to commercial application. Here, we develop a multifunctional molecule passivation strategy using octyltriphenylphosphine bromide (OTPPB) as an additive to prepare high-quality quasi-two-dimensional perovskite LSCs. This multifunctional molecule simultaneously passivates both perovskite cations and anions, reducing defect sites and enhancing the photoluminescence quantum yield (PLQY) of perovskite nanocrystals. The highly steric triphenylphosphine groups hinder ion migration, while the hydrophobic nature of the long alkyl chains prevents water erosion, thereby enhancing the long-term stability of perovskite films. Therefore, we believe that the multifunctional molecular passivation strategy has potential advantages in perovskite LSC applications and can contribute to green technology and sustainable development. Summary of the Invention This study uses the multifunctional OTPPB molecular additive to passivate quasi-two-dimensional perovskites, producing high-quality perovskite films via a one-step spin coating process. Using a transparent polymer encapsulation process, a high-performance luminescent solar concentrator was fabricated, demonstrating excellent long-term environmental stability under indoor conditions. The device structure consists of a glass substrate / perovskite film luminescent layer / polymethyl methacrylate (PMMA) protective layer.

[0004] The product structure and device performance obtained by the present invention are as follows:

[0005] 1. Figure 1 , Stability study of perovskite LSCs: Changes in PL intensity of perovskite films before and after PMMA encapsulation with storage time at room temperature.

[0006] 2. Figure 2 , Schematic diagram of coupling the edge of a large-area perovskite LSC with a silicon cell under indoor lighting.

[0007] 3. Figure 3 , Light conversion performance of perovskite LSC: IV curves of perovskite LSC before and after coupling with Si battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] 1. Figure 1 See the instructions attached Figure 1 After 30 days of storage in a room environment, the OTPPB-passivated perovskite film still retained 81% of its initial PL intensity. To further improve the stability of the perovskite film, a PMMA polymer layer was coated on the perovskite film, and its PL intensity showed a negligible decrease (the PL intensity retained 96% of the initial value).

[0009] 2. Figure 2 See the instructions attached Figure 2 Schematic diagram of coupling the edge of a large-area perovskite LSC with a silicon cell under indoor lighting.

[0010] 3. Figure 3 See the instructions attached Figure 3 In a perovskite LSC with a size of 50 mm × 50 mm × 4 mm, the maximum light conversion efficiency η opt After 30 days of indoor storage, the photoconversion efficiency of the perovskite LSC decreased to 6.3%, still maintaining 97% of the initial optical efficiency.

[0011] Advantages and Positive Effects of the Present Invention: By employing a multifunctional molecular additive passivation strategy, the present invention successfully prepared high-performance perovskite thin films and achieved high-efficiency, long-term stable perovskite LSCs. This invention demonstrates that perovskite LSCs, with their advantages of high efficiency, stability, and low cost, hold broad promise in solar energy conversion and photovoltaic applications. This invention provides new insights for the further development of perovskite LSCs and promotes advancements in LSC technology. It should be noted that the claims of the present invention are subject to various modifications and variations within their defined scope. DETAILED DESCRIPTION

[0012] The following preparation examples can be used to further illustrate the present invention, but are not intended to limit the present invention.

[0013] Implementation Examples

[0014] (1) Preparation of perovskite LSC:

[0015] The glass substrates were cleaned with deionized water, acetone, and isopropanol in an ultrasonic bath and treated with oxygen plasma for 10 minutes to form a hydrophilic surface. The perovskite precursor solution was prepared by dissolving CsBr, FABr, PEABr, and PbBr2 in DMSO in proportion and adding 10% molar (relative to PbBr2) of OTPPB additive. The perovskite precursor solution was spin-coated on the glass substrate at 4000 rpm for 60 seconds and then annealed at 80°C for 5 minutes. During the spin-coating process, chlorobenzene was quickly added dropwise to the sample to promote the crystallization of the perovskite. To prepare the PMMA-protected samples, a PMMA solution (200 mg ml -1 ) were spin-coated at 2000 rpm for 30 seconds and annealed at 80°C for 5 minutes. The perovskite TUM was tested in a nitrogen-filled glove box.

[0016] (2)Perovskite film performance test:

[0017] The PL of the perovskite film was measured by a QEPro spectrometer (Ocean Optics, America) under the excitation of a monochromatic Hg lamp.

[0018] (3) LSC device performance test:

[0019] In indoor environments, at 100 mW cm -2 The current-voltage (IV) characteristics of the LSC device were recorded using a solar simulator (SOFN Instruments Co., Ltd.) under AM 1.5G illumination. The LSC device was placed perpendicular to the direct beam component of the solar simulator. The solar simulator's light intensity was calibrated using a standard silicon solar cell certified by the U.S. National Renewable Energy Laboratory.

Claims

1. A method for preparing an efficient and stable luminescent solar concentrator by passivating a perovskite film with a multifunctional molecular additive, characterized in that: Passivation of quasi-two-dimensional perovskite films using multifunctional molecular additives.

2. The luminescent solar concentrator according to claim 1, characterized in that: The perovskite film passivated with octyltriphenylphosphine bromide ligand was used as the light-emitting layer.

3. The luminescent solar concentrator according to claim 1 or 2, characterized in that: A luminescent solar concentrator with a device structure of glass substrate (Galss) / quasi-two-dimensional perovskite thin film light-emitting layer (Perovskite film) passivated by octyltriphenylphosphine bromide ligand / polymethyl methacrylate protective layer (PMMA, 200 mg ml-1) was designed.

4. The luminescent solar concentrator according to claim 3, characterized in that: The photoluminescence quantum yield of the perovskite film reached 100%, and after being stored in an indoor environment for 30 days, it maintained 97% of the luminescence intensity, achieving a luminescent solar concentrator with a light conversion efficiency of 6.5%.

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