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A kind of organic solar cell structure and preparation method based on discotic liquid crystal column

A technology for solar cells and discotic liquid crystals, which is applied in the field of organic solar cell device preparation and can solve the problems of low charge mobility and the like

Active Publication Date: 2020-08-11
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at various defects of 3-dimensional charge transport in current organic solar cells, the present invention provides a method with lower cost, simpler preparation process and certain universality to solve such defects
Using HATP as the interface layer method realizes a more universal 3D charge transport channel, solves the problem of low charge mobility in organic solar cells, and suppresses the defect states and triplet excitons at the bottom of the active layer. Generated, realized the organic solar cell J SC And further improvement of PCE, and more suitable for future commercial production, has a good application prospect

Method used

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  • A kind of organic solar cell structure and preparation method based on discotic liquid crystal column
  • A kind of organic solar cell structure and preparation method based on discotic liquid crystal column
  • A kind of organic solar cell structure and preparation method based on discotic liquid crystal column

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Embodiment 1

[0088] An organic solar cell structure based on a discotic liquid crystal column, including a transparent conductive substrate, a hole transport layer, a discotic liquid crystal layer, an organic active layer, an electron transport layer, a metal electrode, and materials for the discotic liquid crystal layer from bottom to top It is a discotic liquid crystal material, and the discotic liquid crystal layer is a discotic liquid crystal column formed by several discotic liquid crystal columnar modules.

[0089] The structure of the discotic liquid crystal column is as figure 2 As shown, the discotic liquid crystal columnar module in the discotic liquid crystal layer and the photovoltaic material in the organic active layer form a 3D charge transport, which not only improves the charge mobility, but also suppresses the generation of triplet excitons and the bottom defects of the active layer The distribution of states increases the number of carriers and improves the short-circui...

Embodiment 2

[0092] According to a kind of organic solar cell structure based on discotic liquid crystal column described in embodiment 1, its difference is:

[0093] The organic active layer is binary fullerene system PBDB-T:PC 71 BM, binary fullerene system PBDB-T:PC 71 BM includes donor material high molecular polymer and acceptor material fullerene derivative, high molecular polymer is PBDB-T, fullerene derivative is PC 71 BM.

[0094] From the binary fullerene system PBDB-T:PC 71 The organic active layer composed of BM contains PBDB-T microcrystals with face-on crystallographic orientation and PC with isotropy. 71 The BM aggregates, the two interact with the discotic liquid crystal columns to form a 3-dimensional charge transport, which greatly improves the electron mobility and the number of carriers.

Embodiment 3

[0096] According to a kind of organic solar cell structure based on discotic liquid crystal column described in embodiment 1, its difference is:

[0097] The organic active layer is a binary non-fullerene system PBDB-T:IT-M, and the binary non-fullerene system PBDB-T:IT-M includes a donor material polymer and an acceptor material small molecule material, high The molecular polymer is PBDB-T, and the small molecule material is IT-M.

[0098] The active layer composed of the binary non-fullerene system PBDB-T:IT-M contains PBDB-T and IT-M crystallites dominated by face-on crystallographic orientations, both of which interact with discotic liquid crystal columns to form The 3-dimensional charge transport not only improves the charge mobility and the number of carriers, but also reduces the sensitivity of the device performance to the thickness of the active layer.

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Abstract

The invention relates to an organic solar cell structure based on a discotic liquid crystal column and a preparation method thereof, comprising a transparent conductive substrate, a hole transport layer, a discotic liquid crystal layer, an organic active layer, an electron transport layer, and a metal electrode from bottom to top. , the material of the discotic liquid crystal layer is a discotic liquid crystal material, and the discotic liquid crystal layer is a discotic liquid crystal column formed by a plurality of discotic liquid crystal columnar modules. The present invention adds a discotic liquid crystal layer, increases the size of the microcrystals with face-on and edge-on crystallographic orientations in the active layer, and realizes the charge transmission and three-dimensional charge between the donor, the acceptor and the HATP discotic liquid crystal column Transport channel; electron mobility has been greatly improved; the generation of triplet excitons has been suppressed, and the yield of free carriers has been increased; the photoelectric conversion efficiency has been improved; photoelectric conversion in organic solar cells based on non-fullerene systems has been inhibited The sensitivity of the efficiency to the thickness of the active layer helps future roll-to-roll production.

Description

technical field [0001] The invention relates to an organic solar cell structure based on a discoid liquid crystal column and a preparation method thereof, and belongs to the technical field of organic solar cell device preparation. Background technique [0002] In the past few decades, organic solar cells have attracted great attention due to their many advantages such as light weight, low cost, and simple preparation process. In the recent period, the photoelectric conversion efficiency of bulk heterojunction organic solar cells composed of donors and acceptors as organic photovoltaic materials has reached a maximum of more than 16%. Among them, there are many methods that can improve battery performance, such as thermal annealing treatment, solvent annealing treatment, additive treatment, and the like. However, these methods have undergone very mature development, and the research on their detailed regulation and internal physical mechanism has gained wide recognition. 3...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/42H01L51/46H01L51/48
CPCH10K71/12H10K85/731H10K30/20Y02E10/549Y02P70/50
Inventor 郝晓涛王桐
Owner SHANDONG UNIV
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