Eliminating the Imbalanced Mobility Bottlenecks via Reshaping Internal Potential Distribution in Organic Photovoltaics

Abstract

The imbalanced carrier mobility remains a bottleneck for performance breakthrough in even those organic solar cells (OSCs) with recorded power conversion efficiencies (PCEs). Herein, a counter electrode doping strategy is proposed to reshape the internal potential distribution, which targets to extract the low mobility carriers at far end. Device simulations reveal that the key of this strategy is to partially dope the active layer with a certain depth, therefore it strengthens the electric field for low mobility carriers near counter electrode region while avoids zeroing the electric field near collection electrode region. Taking advantage of these, PCE enhancements are obtained from 15.4% to 16.2% and from 16.9% to 18.0%, respectively, via cathode p‐doping and anode n‐doping. Extending its application from opaque to semitransparent devices, the PCE of dilute cell rises from 10.5% to 12.1%, with a high light utilization efficiency (LUE) of 3.5%. The findings provide practical solutions to the core device physical problem in OSCs.

Self-Powered Intelligent Tactile-Sensing System Based on Organic Electrochemical Transistors

“…When the gate bias is applied, the channel conductivity varies in accordance with the doping level of the active layer. By adjusting the channel conductivity, OECT can replicate fundamental synaptic behaviors, including short-term plasticity such as paired-pulse facilitation (PPF), adaptive plasticity, and long-term plasticity associated with learning and memory. − Among various photovoltaic cells, OSCs exhibit advantages in output management and flexibility due to their ability to easily modulate output voltage and current through modification and matching of photovoltaic materials. − This enables precise control of power supply output according to sensor requirements, thereby achieving high detection and monitoring capabilities without the need for resistors or other circuit elements. , Consequently, OSCs exhibit promising potential as viable options for self-powered devices.…”