Over the past few decades,the electrochemical reactions usually result in conducting conjugated polymers with an unavoidable highly doped state.In fact,the resulting conjugated polymers and highly doped states are often unnecessary( or disadvantageous) for a wide library of building blocks.Herein,we describe an electrochemical synthesis of electrophotoactive films by using a quantitative( reaction-limited) electrochemical reaction,which prevents the formation of a conducting conjugated polymer as a first example of preparation of a low-doped non-conjugated polymer.This is a breakthrough in the broadening of the potential applications of electrochemical synthesis into the field of device fabrications.