Flat-shell core structure perovskite nanowire solar cell

Abstract

The present invention discloses a flat-type shell-core structure perovskite nanowire solar cell. Sunlight does not need to be incident from the side but can be incident directly from the front of the cell, thereby improving the efficiency of the device, which will make it very suitable for fields such as smart wearables. A flat-type shell-core structure perovskite nanowire solar cell includes a sheet-shaped substrate, a first electrode and a second electrode in the form of strips are respectively provided at both ends of the substrate, the first electrode and the second electrode are parallel to each other, and a plurality of shell-core structure perovskite nanowires are arranged in a planar array between the first electrode and the second electrode, each shell-core structure perovskite nanowire is parallel to each other. The shell-core structure perovskite nanowire includes a core layer made of a transmission material and a shell layer made of a perovskite material. The core layer is connected to the first electrode, and the shell layer is connected to the second electrode.

Description

Technical Field

[0001] The present invention relates to the technical field of solar cells, and in particular to a flat shell-core structured perovskite nanowire solar cell. Background Art

[0002] Nanowires with perovskite shells and a transport material core are expected to achieve high photoelectric conversion efficiencies in solar cells. Currently, conventional shell-core nanowire arrays are upright structures. However, if these perovskite nanowire arrays, with a light-absorbing layer, are used in solar cells, sunlight must enter the cell from the side, affecting device performance. Summary of the Invention

[0003] The purpose of the present invention is to overcome the shortcomings of the existing technology and provide a flat shell-core structure perovskite nanowire solar cell. Sunlight does not need to be incident from the side but can be directly incident from the front of the cell, thereby improving the efficiency of the device, which will make it very suitable for fields such as smart wearables.

[0004] The object of the present invention is achieved like this:

[0005] A flat-type shell-core structure perovskite nanowire solar cell includes a sheet-shaped substrate, with a first electrode and a second electrode in the form of strips provided at both ends of the substrate, the first electrode and the second electrode being parallel to each other, and a plurality of shell-core structure perovskite nanowires being arranged in a planar array between the first electrode and the second electrode, the shell-core structure perovskite nanowires being parallel to each other, the shell-core structure perovskite nanowires including a core layer made of a transmission material and a shell layer made of a perovskite material, the core layer being connected to the first electrode, and the shell layer being connected to the second electrode.

[0006] Preferably, at least one of the substrate, the first electrode, the second electrode, and the core-shell perovskite nanowire is made of a flexible material.

[0007] Preferably, the core layer is arranged on the substrate, one end of the core layer is connected to the first electrode, the shell layer covers the core layer, a distance is left between one end of the shell layer and the first electrode, and the other end of the shell layer seals the core layer and is connected to the second electrode.

[0008] Preferably, the tiled shell-core structure perovskite nanowire solar cell is applied to a smart wearable device to power the smart wearable device.

[0009] A method for manufacturing a flat shell-core structured perovskite nanowire solar cell comprises the following steps:

[0010] S1. Disposing a first electrode at one end of the substrate;

[0011] S2, preparing a core layer on a substrate;

[0012] S3, preparing a shell layer on the core layer;

[0013] S4. Dispose a second electrode at the other end of the substrate.

[0014] Preferably, step S2 includes:

[0015] S21, preparing a template, and etching a groove on the template using an electron beam exposure method;

[0016] S22, the template is placed with the groove downward, and is bonded and fixed to the substrate, forming a core layer accommodation space between the groove and the substrate, and then immersed in the core layer sol until the core layer sol fills the accommodation space;

[0017] S23. After drying and annealing, retain the template portion above the first electrode and remove the remaining template portions to form a core layer along the plane array.

[0018] Preferably, the substrate and the core layer have opposite hydrophilicity and hydrophobicity, and step S3 includes:

[0019] S31, adding a solvent to the perovskite sol to prepare a shell sol, wherein the hydrophilicity of the solvent is the same as the hydrophilicity of the core layer;

[0020] S32. Immerse the substrate with the core layer in the shell layer sol, and after drying and annealing, construct a shell-core structure nanowire array.

[0021] Preferably, in step S32, the end of the substrate having the core layer facing away from the first electrode is immersed in the shell sol, with a distance being left between the liquid surface of the shell sol and the first electrode.

[0022] Due to the adoption of the above technical solution, the tiled shell-core structure perovskite nanowire solar cell has the following beneficial effects:

[0023] (1) Anti-reflection and strong light-gathering ability;

[0024] (2) Small size, which is conducive to the miniaturization of devices;

[0025] (3) Good flexibility, suitable for the preparation of flexible devices;

[0026] (4) Easy to crystallize, which can reduce the electron-hole recombination rate;

[0027] (5) More suitable for transporting carriers, increasing carrier diffusion intensity and lifespan, etc.

[0028] Because of these advantages, nanowires are expected to achieve high photoelectric conversion efficiency when used in solar cells. Furthermore, their flexibility and miniaturization make them suitable for smart wearable devices. Considering that normal use of smart wearable devices requires sunlight incident from the front, flat shell-core perovskite nanowire array solar cells can meet the power needs of flexible devices such as smart wearables, laying the foundation for their development. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of the structure of the battery of the present invention;

[0030] Figure 2 for Figure 1 Schematic top view of

[0031] Figure 3 for Figure 2 AA cross-sectional view of ;

[0032] Figure 4 Schematic diagram of the production method of the present invention.

[0033] Reference numerals

[0034] In the figures, 1 is a substrate, 2 is a first electrode, 3 is a second electrode, 4 is a core layer, 5 is a shell layer, and 6 is a template. DETAILED DESCRIPTION

[0035] See also Figure 1-Figure 3 , is a flat-type shell-core structure perovskite nanowire solar cell, including a sheet-shaped substrate (using insulating material), with a first electrode and a second electrode in the form of strips electroplated at both ends of the substrate, the first electrode and the second electrode being parallel to each other, and a plurality of shell-core structure perovskite nanowires are arranged in a planar array between the first electrode and the second electrode, each shell-core structure perovskite nanowire being parallel to each other, the shell-core structure perovskite nanowire including a core layer made of a transmission material and a shell layer made of a perovskite material, the core layer being connected to the first electrode, and the shell layer being connected to the second electrode.

[0036] The core layer is disposed on a substrate, one end of the core layer being connected to a first electrode. The shell layer covers the core layer, with a gap between one end of the shell layer and the first electrode to prevent electrical conduction between the shell layer and the first electrode. The other end of the shell layer seals the core layer and is connected to a second electrode. The first electrode is embedded in the substrate, a template is fixed to the first electrode, and the core layer is fixed in a groove provided in the template.

[0037] At least one of the substrate, first electrode, second electrode, and core-shell perovskite nanowires is made of a flexible material. This further meets the practical needs of flexible devices such as smart wearables. The tiled core-shell perovskite nanowire solar cell is ideally suited for powering smart wearable devices.

[0038] See also Figure 4 A method for manufacturing a flat shell-core structured perovskite nanowire solar cell comprises the following steps:

[0039] S1, electroplating a first electrode at one end of the substrate;

[0040] S2, preparing a core layer on a substrate; step S2 includes:

[0041] S21, preparing a template, and etching a groove on the template using an electron beam exposure method, wherein the groove width is about 100 nm;

[0042] S22, the template is placed with the groove downward, and is bonded and fixed to the substrate, forming a core layer accommodation space between the groove and the substrate, and then immersed in the core layer sol until the core layer sol fills the accommodation space;

[0043] S23. After drying and annealing, retain the template portion above the first electrode and remove the remaining template portions to form a core layer along the plane array.

[0044] S3, preparing a shell layer on the core layer; the substrate and the core layer have opposite hydrophilicity and hydrophobicity, and step S3 includes:

[0045] S31, adding a solvent to the perovskite sol to prepare a shell sol, wherein the hydrophilicity of the solvent is the same as the hydrophilicity of the core layer;

[0046] S32: Immerse the core substrate in the shell sol, dry, and anneal, to form a core-shell nanowire array. In step S32, the end of the core substrate facing away from the first electrode is immersed in the shell sol, with a gap between the shell sol liquid surface and the first electrode.

[0047] By utilizing the hydrophilic and hydrophobic properties of the material, the problem of the shell material covering the entire substrate can be effectively solved, thereby hopefully obtaining a shell / core structured perovskite nanowire array solar cell with high photoelectric conversion efficiency.

[0048] One embodiment is: the substrate is made of a hydrophobic material, the core layer is made of a hydrophilic material, and the solvent is a hydrophilic solvent, such as dimethylformamide (DMF), dimethyl sulfoxide (DMSO), or diethyl ether. In this embodiment, the substrate is made of a silicon wafer or PVDF (flexible), the core layer is made of titanium dioxide, and the solvent is dodecanedioic acid (DDDA). DDDA has carboxyl groups at both ends, one end easily contacting the Ti4+ in the titanium dioxide (electron transport layer - core layer), while the other end has a hydrophilic carboxyl group.

[0049] Another embodiment is: the substrate is made of a hydrophilic material, the core layer is made of a hydrophobic material, and the solvent is a hydrophobic solvent. In this embodiment, the substrate is made of flexible PET, the core layer is made of the fullerene derivative N-methyl-2-pentylfullerene pyrrolidine (NMPFP), and the solvent is o-dichlorobenzene or chlorobenzene.

[0050] S4. Electroplating a second electrode on the other end of the substrate.

[0051] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A tiled core-shell perovskite nanowire solar cell, characterized by: The invention comprises a sheet-shaped substrate, wherein a first electrode and a second electrode in the form of strips are respectively provided at both ends of the substrate, the first electrode and the second electrode are parallel to each other, and a plurality of shell-core structured perovskite nanowires are arranged in a planar array between the first electrode and the second electrode, each shell-core structured perovskite nanowire is parallel to each other, and the shell-core structured perovskite nanowires include a core layer made of a transmission material and a shell layer made of a perovskite material, the core layer is connected to the first electrode, and the shell layer is connected to the second electrode; The core layer is arranged on the substrate, one end of the core layer is connected to the first electrode, the shell layer covers the core layer, a gap is left between one end of the shell layer and the first electrode, and the other end of the shell layer seals the core layer and is connected to the second electrode; The first electrode is embedded in the substrate, a template is fixed on the first electrode, and the core layer is fixed in a groove provided on the template.

2. The flat core-shell perovskite nanowire solar cell according to claim 1, characterized in that: At least one of the substrate, the first electrode, the second electrode, and the core-shell perovskite nanowire is made of a flexible material.

3. The flat core-shell perovskite nanowire solar cell according to claim 1, characterized in that: Flat-type shell-core structure perovskite nanowire solar cells are used in smart wearable devices to power smart wearable devices.

Images