Highly Sensitive and Temperature‐Insensitive Stretchable Strain Sensor with Microcrack‐Engineered Architecture

ABSTRACT Highly sensitive, stretchable strain sensors with minimal temperature dependence are essential for precise strain monitoring in human and robotic applications across diverse environments. Although strain sensors with near‐zero temperature coefficient of resistance (TCR) have been investigated, achieving high sensitivity while maintaining temperature insensitivity remains a significant challenge. This study proposes a stretchable strain sensor that demonstrates a high gauge factor of 2.3 × 10 4 and excellent linearity ( R 2 = 0.98), while maintaining temperature insensitivity under applied strain. This performance is achieved through a microcrack architecture formed by stacking a brittle, low‐resistance material with a stretchable, high‐resistance material with near‐zero TCR. The formation of microcracks redirects the current pathway from a low to a high‐resistance material. The absolute TCR value remains below 0.1% K −1 across a strain range of 5%–50%. Furthermore, the peak resistance under 50% cyclic strain fluctuates by only 7% between 25°C and 65°C.