Paper generators are novel, paper-like energy-harvesting structures that generate energy through user gestures such as sliding, tapping, rubbing, and touching. Most importantly, these paper generators are built with electrets, which are widely used in numerous devices, especially energy-efficient sensors and microelectromechanical-based systems, for harvesting energy. The paper introduces explicit power generation where users generate power to obtain the desired feature, a significant shift from traditional energy harvesting where the wasted energy is incidentally collected. Electricity needs may hinder the feasibility of devices by requiring high weight, cost, and size while reducing battery life. This paper provides a unique design to overcome these kinds of obstacles with electricity generation through swipe actions.

The paper generator model is created by a 127-micrometer thick sheet of silver-coated polyester (the electrode) with polytetrafluoroethylene (PTFE). Short circuit current analysis shows that a faster swipe generates more power, but power generation is restricted to swipe direction. The experimental results show that power generation varies from user to user based on speed and direction of the swipe. The authors also propose various designs for paper generators with highly economical energy-harvesting circuits. The paper generator can have a significant impact on new LED designs, tablet readers, and electronic paper. This invention may create new research possibilities in environment- and nature-friendly technology products. The paper is well written, with extensive analysis of issues including power generation and the cost of the paper generator materials.