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Updated: Apr 26, 2026

Printing Fabrication of Bulk Heterojunction Solar Cells and In Situ Morphology Characterization

Printing Fabrication of Bulk Heterojunction Solar Cells and In Situ Morphology Characterization

Published on: January 29, 2017

Mobility guidelines for high fill factor solution-processed small molecule solar cells.

Christopher M Proctor¹, John A Love, Thuc-Quyen Nguyen

¹Center for Polymers and Organic Solids, University of California, Santa Barbara, CA, 93106, USA; Materials Department, University of California, Santa Barbara, CA, 93106, USA.

Advanced Materials (Deerfield Beach, Fla.)

|July 23, 2014

Summary

This summary is machine-generated.

Achieving a high fill factor (FF) in organic solar cells requires both hole and electron mobilities exceeding 10(-4) cm(2) V(-1) s(-1). Neat-film mobility measurements effectively predict blend film performance.

Keywords:

charge transport organic electronics photovoltaic devices small molecules solar cells

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Area of Science:

Materials Science
Organic Electronics
Photovoltaics

Background:

Solution-processable small-molecule organic solar cells offer potential for low-cost energy generation.
Achieving high power conversion efficiency in these devices is critically dependent on charge transport properties.

Purpose of the Study:

To establish the critical charge-carrier mobility thresholds necessary for high fill factor (FF) in bulk-heterojunction (BHJ) organic solar cells.
To evaluate the predictive capability of neat-film mobility measurements for BHJ solar cell performance.

Main Methods:

Analysis of experimentally measured charge-carrier mobilities (hole and electron) and fill factors (FF) in small-molecule BHJ solar cells.
Correlation of neat-film charge-carrier mobility data with the performance metrics of corresponding blend-film solar cells.

Main Results:

A minimum hole and electron mobility of greater than 10(-4) cm(2) V(-1) s(-1) is identified as essential for achieving a high FF.
Neat-film mobility measurements demonstrate a strong correlation with, and serve as a reliable predictor for, the maximum achievable blend-film mobility and FF.

Conclusions:

Optimizing charge transport, specifically achieving high mobilities for both charge carriers, is crucial for high-performance organic solar cells.
Neat-film mobility measurements provide a valuable and efficient screening method for material selection and device design in small-molecule BHJ solar cells.