Heterojunction organic photovoltaic cells as molecular heat engines: A simple model for the performance analysis

TL;DR

This paper presents a minimal theoretical model for organic heterojunction solar cells, analyzing their performance as molecular heat engines through dynamical and thermodynamic properties.

Contribution

It introduces a simple, physically motivated model that captures key behaviors and allows explicit calculation of efficiency and power output for organic photovoltaic cells.

Findings

Model reproduces qualitative current-voltage behavior

Provides explicit formulas for thermodynamic efficiency

Identifies optimal conditions for maximum power

Abstract

Organic heterojunction solar cells are analyzed within a minimal model that includes the essential physical features of such systems. The dynamical properties of this model, calculated using a master equation approach, account for the qualitative behavior of such systems. The model yields explicit results for current-voltage behavior as well as performance characteristics expressed in terms of the thermodynamic efficiency as well as the power conversion efficiency at maximum power, making it possible to evaluate the optimal setup for this device model.