Shock recording device

A method for determining whether or not a shock was applied to a shock recording device, the method comprising:

• (a) preparing the shock recording device comprising:
• a vibration energy harvester comprising a first electrode and a second electrode, the vibration energy harvester converting an energy of a shock applied thereto into a potential difference between the first electrode and the second electrode;
• and
• a ferroelectric transistor comprising a gate electrode, a source electrode, and a drain electrode, the ferroelectric transistor further comprising a stacked structure of a ferroelectric layer and a semiconductor layer,
• wherein
• the gate electrode is electrically connected to the first electrode;
• and
• the source electrode is electrically connected to the second electrode;
• (b) measuring a resistance value of the semiconductor layer through the drain electrode and the source electrode;
• and
• (c) determining whether or not a shock was applied to the shock recording device based on the resistance value, and
• wherein the shock recording device further comprises a zener diode which is electrically connected to the source electrode and the drain electrode.