Solar Cell Materials Overview

Principles

Definition

Solar cell materials is a research field and academic concept focused on the investigation, development, and characterization of substances capable of converting light energy into electrical energy through the photovoltaic effect. This field explores the diverse physical, chemical, and electronic properties of materials such as semiconductors, organic polymers, and perovskites to enhance the efficiency, durability, and cost-effectiveness of solar photovoltaic devices.

Ontological type

Material Classes

Performance Drivers

Stability and Degradation

Key developments

Key Figures

Interfacial Charge Engineering era

Alan J. Heeger [1], a leading figure in this era of interfacial charge engineering, was associated with Stanford University [2] and the University of Pennsylvania [3]. His key contribution in this era was the demonstration and promotion of polymer photovoltaic concepts built on networks of internal donor–acceptor heterojunctions, exemplified by Polymer Photovoltaic Cells: Enhanced Efficiencies via a Network of Internal Donor-Acceptor Heterojunctions [4], which underlined how interfacial energetics and exciton dissociation govern charge separation and laid the groundwork for scalable, low-cost device architectures.

Bulk-Heterojunction Morphology era

Christoph J. Brabec[1] was a leading figure in bulk-heterojunction solar cell materials during the 2002–2008 era, with affiliations at the University of Cologne[2] and The University of Texas at Dallas[3]. In the 2006 paper Design Rules for Donors in Bulk-Heterojunction Solar Cells—Towards 10% Energy-Conversion Efficiency[4], Brabec outlined donor design rules that linked molecular structure to nanoscale BHJ morphology, providing a framework for tuning domain sizes and percolation pathways that were central to improving efficiency in this era. This era's momentum came from Brabec's integrative approach that connected donor molecular design to nanoscale BHJ morphology, drawing on work conducted at University of Cologne[2] and The University of Texas at Dallas[3] to inform processing strategies that tune domain size and percolation. Ultimately, Brabec's contributions helped anchor the morphology-driven optimization paradigm that defined this era for polymer–fullerene systems[1].

Perovskite Composition Engineering era

Sang Il Seok [1] worked at Ulsan National Institute of Science and Technology [2] and École Polytechnique Fédérale de Lausanne [3] during this era. Solvent engineering for high-performance inorganic–organic hybrid perovskite solar cells [4] introduced solvent-engineering strategies that improved film formation, crystallinity, and device efficiency, enabling scalable fabrication in perovskite photovoltaics. Sang Il Seok [1] contributed to iodide management in formamidinium-lead-halide–based perovskite layers for efficient solar cells [5], addressing iodide-related defects and phase stability to boost operational efficiency. These efforts by Sang Il Seok [1] helped establish the importance of compositional engineering, enabling mixed-cation and mixed-halide strategies that underpin the era’s programmable bandgaps and stability.