Perovskite solar cells (PSCs) are new compound thin-film solar cells that use perovskite materials as light-absorbing layers. Perovskite is named after the Russian mineralogist Perovski, and crystals with the structure ABX3 and similar to it are collectively called perovskites. Perovskite solar cells are solar cells that use perovskite-type organic metal halide semiconductors as light-absorbing materials.
The structure of perovskite cells is mainly composed of the following key parts: transparent conductive substrate, electron transport layer, perovskite light-absorbing layer, hole transport layer and metal electrode. These components work together to enable perovskite cells to effectively absorb sunlight and convert it into electrical energy.
Transparent conductive substrate: This is the basis of perovskite cells, usually made of materials such as fluorine-doped tin oxide (FTO) or indium-doped tin oxide (ITO), with high light transmittance and good conductivity. Its main function is to introduce sunlight and collect the generated current. The choice of transparent conductive substrate is crucial to the performance of perovskite solar cells because it not only affects the incidence of light, but also affects the extraction of current.
Electron transport layer: located between the transparent conductive substrate and the perovskite light-absorbing layer, its main function is to transport electrons. Commonly used electron transport layer materials include titanium dioxide (TiO2), zinc oxide (ZnO), etc. These materials have good electron mobility and stability, and can transfer electrons generated in the perovskite light-absorbing layer to the transparent conductive substrate.
Perovskite light-absorbing layer: This is the core part of the perovskite solar cell, mainly composed of organic halide perovskite materials with ABX3 structure. These materials have excellent photoelectric conversion performance and can effectively convert the energy of sunlight into electrical energy. The preparation process and performance of the perovskite light-absorbing layer have a decisive influence on the overall performance of perovskite solar cells.
Hole transport layer: located between the perovskite light-absorbing layer and the metal electrode, its main function is to transport holes. Commonly used hole transport layer materials include Spiro-OMeTAD, etc. These materials can effectively extract and transport photogenerated holes, thereby improving the photoelectric conversion efficiency of the battery.
Metal electrode: This is the last process of the perovskite solar cell, which is mainly responsible for transmitting charges and connecting to the external circuit. It is usually made by evaporating a layer of gold, silver or aluminum on the outside of the hole transport layer to improve the conductivity of the electrode.
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