Polymer Thin Film Transistor Charge Mobility

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Solution Overview

Problem

Existing organic thin film transistors (OTFTs) face challenges in achieving optimal electrical characteristics and charge mobility due to limitations in semiconductor materials and device structures.

Innovation Solution

A polymer is developed that includes a first repeating unit with an electron donating moiety and a second repeating unit with different electron accepting moieties, randomly arranged in a polymer chain, to enhance charge mobility and semiconductor characteristics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional organic semiconductor materials are used in OTFTs, then the device can be manufactured with current processes, but the electrical characteristics and charge mobility are insufficient

Engineering Contradiction:

Improveelectrical characteristicsVSAvoidmaterial limitations

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent employs a copolymer comprising two distinct repeating units: a first repeating unit with an electron-donating moiety (D1) and a second repeating unit with an electron-accepting moiety (A1). This composite polymer structure combines the beneficial electronic properties of both donor and acceptor units, achieving superior charge mobility and electrical characteristics while remaining compatible with existing organic semiconductor manufacturing processes

Inventive Principle:

Principle #40Composite materials

2Reliability

If a polymer with electron donating and electron accepting moieties is used, then charge mobility is enhanced, but the polymer structure becomes more complex

Engineering Contradiction:

Improvecharge mobilityVSAvoidpolymer structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent divides the polymer structure into distinct functional segments: repeating units containing electron-donating moieties (D1) and repeating units containing electron-accepting moieties (A1). This segmentation allows each unit to perform its specific electronic function while maintaining overall polymer processability. The copolymer architecture enables independent optimization of donor and acceptor properties without requiring complete structural redesign

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent optimizes the ratio of first repeating units to second repeating units in the copolymer chain to achieve desired charge mobility while controlling structural complexity. By adjusting the compositional parameters and molecular weight of the copolymer, the invention balances electrical performance with manufacturability, demonstrating that parameter optimization can resolve the trade-off between performance enhancement and structural simplicity

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20250129205A1Polymer and thin film transistor and electronic device

Publication Date: 2025.04.24 SAMSUNG ELECTRONICS CO LTD

AI summary

Disclosed are a polymer including a first repeating unit represented by Chemical Formula 1 and a second repeating unit represented by Chemical Formula 2, a thin film transistor including the same, and an electronic device.In Chemical Formula 1 or 2, D1, A1, A2, L1 to L6, R1, and R2 are the same as described in the detailed description.