Perovskite solar cell and preparation method based on transition metal sulfide/ternary sulfide quantum dot composite hole transport layer

Abstract

The invention provides a perovskite solar cell based on a transition metal sulfide / ternary sulfide quantum dot composite hole transport layer and a preparation method, specifically, firstly adopting a liquid phase method to deposit a perovskite on the surface of an electron transport layer supported by a conductive glass Mineral light-absorbing layer, then spin-coating quantum dot composite hole transport layer, and finally blade-coating carbon electrode to assemble a perovskite solar cell. The invention introduces ternary sulfide quantum dots to passivate the surface defects of transition metal sulfide quantum dots, obtains a quantum dot composite hole layer with high hole conductivity and energy level tunability, and effectively reduces the perovskite layer and carbon The energy level difference between electrodes enhances interfacial contact and hole extraction and mobility, while the anchoring effect of sulfur in composite quantum dots and free lead ions on the perovskite surface passivates interface defects, reduces nonradiative recombination, and realizes calcium Improvement in efficiency and stability of titanite solar cells. The preparation method of the invention is simple and feasible, the material improvement space is large, and the invention has a good application prospect.

Description

technical field [0001] The invention belongs to the field of new material technology and new energy technology, and specifically relates to a perovskite solar cell based on a transition metal sulfide / ternary sulfide quantum dot composite hole transport layer and a preparation method. Background technique [0002] With the depletion of traditional energy sources, more and more attention has been paid to the clean, harmless and inexhaustible natural solar energy resources. Using solar cells to directly convert solar energy into electrical energy is one of the cleanest and most efficient ways to utilize solar energy resources. Among them, perovskite solar cells have become a photovoltaic device that has attracted much attention due to their simple preparation process and high efficiency, but common organic-inorganic hybrid perovskite solar cells are easily decomposed in moisture and oxygen environments, resulting in poor device performance. Stablize. Recently, carbon-based al...

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Problems solved by technology

However, quantum dot materials are affected by surface effects, and there are usually a large number of defect states at the grain boundaries, which can easily cause non-radiative recombination of charges and reduce the power output characteristics of the device.

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