Perovskite solar cell electron transport layer, preparation method and application thereof

By using an O-phosphate-L-threonine-doped SnO2 solution in perovskite solar cells, the problems of numerous electron transport layer defects and interface energy level mismatch were solved, thereby improving the photoelectric conversion efficiency and stability of the device.

CN122121519APending Publication Date: 2026-05-29BEIJING UNIV OF TECH
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Patent Information

Application Number
CN202610248287.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-02
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing perovskite solar cells suffer from numerous defects in the electron transport layer, poor interface energy level matching, severe charge recombination, and poor device stability.

Method used

O-phosphoric acid-L-threonine (PT) doped SnO2 solution was used as an electron transport layer. After ultrasonic treatment, it was coated onto the substrate surface to form the electron transport layer of perovskite solar cell. The phosphate, carboxyl and amino functional groups of PT formed stable coordination bonds and hydrogen bonds with SnO2 and perovskite layer, which passivated defects and optimized the interface energy level matching.

Benefits of technology

It significantly improved carrier transport capability, photoelectric conversion efficiency and device stability, with efficiency increasing from 22.35% to 24.12%, open-circuit voltage increasing from 1.11 V to 1.16 V, and fill factor increasing from 79.3% to 81.2%.

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Abstract

The application discloses a perovskite solar cell electron transport layer and a preparation method and application thereof, and relates to the technical field of solar cell preparation. The method comprises the following steps: adding O-phospho-L-threonine into a SnO2 colloidal aqueous solution, and performing ultrasonic treatment to obtain a PT-doped SnO2 solution; and coating the PT-doped SnO2 solution onto the surface of a substrate to form a perovskite solar cell electron transport layer. The unique molecular structure of O-phospho-L-threonine (PT) is utilized to realize a multiple synergistic modification effect, and the device performance is improved. The preparation process is simple. The application solves the problems of the existing perovskite solar cell, such as many defects of the electron transport layer, poor interface energy level matching, serious charge recombination and poor device stability.
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