Transport resistance strikes back: unveiling its impact on fill factor losses in organic solar cells

The fill factor (\(FF\)) is a critical parameter for solar cell efficiency, yet its analytical description is challenging due to the interplay between recombination and charge extraction processes. An often overlooked yet significant factor contributing to \(FF\) losses, beyond recombination, is the...

Full description

Saved in:
Bibliographic Details
Published in:arXiv.org 2024-04
Main Authors: Saladina, Maria, Deibel, Carsten
Format: Article
Language:English
Subjects:
Charge transport
Low conductivity
Luminous intensity
Mathematical models
Open circuit voltage
Photovoltaic cells
Solar cells
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The fill factor (\(FF\)) is a critical parameter for solar cell efficiency, yet its analytical description is challenging due to the interplay between recombination and charge extraction processes. An often overlooked yet significant factor contributing to \(FF\) losses, beyond recombination, is the influence of charge transport. In most state-of-the-art organic solar cells, the primary limitation of the \(FF\) arises not from recombination but rather from low conductivity, highlighting the need for refined models to predict the \(FF\) accurately. Here, we extend the analytical model for transport resistance to a more general case. Drawing from a large set of experimental current-voltage and light intensity-dependent open-circuit voltage data, we systematically incorporate crucial details previously omitted in the model. Consequently, we introduce a straightforward set of equations to predict the \(FF\) of a solar cell, enabling the differentiation of losses attributed to recombination and transport resistance. Our study provides valuable insights into strategies for mitigating \(FF\) losses based on the experimentally validated analytical model, guiding the development of more efficient solar cell designs and optimization strategies.
ISSN:2331-8422