A Large Area Organic Solar Module with Non-Halogen Solvent Treatment, High Efficiency, and Decent Stability
SOLAR RRL(2023)
Abstract
It is a challenge to fabricate organic solar modules with the combination of high efficiency, good stability, and green solvent treatment. To address the issue, active layer materials still play crucial roles. Herein, a non-fullerene acceptor CH7 with the extended conjugation central unit and long-branched side chains is reported for the fabrication of high-performance large-area modules. The long-branched alkyl chains can ensure CH7 to have good solubility in non-halogen solvent o-xylene (OX). Meanwhile, the steric hindrance of long-branched alkyl chains can suppress molecular excessive aggregation. The inverted structure prototype device based on PM6:CH7 and processed with OX showed a promising power conversion efficiency (PCE) of 17.49% mainly due to the favorable active layer morphology. Based on the small area device results, processed from OX, a 25.2 cm(2) module is fabricated and demonstrates a high PCE of 14.42% and good photo stability with maintaining 93% of its initial efficiency after 500 h continuous illumination. Moreover, the module also shows decent thermal stability, maintaining with 82% of its original efficiency after the thermal stress at 65 degrees C for 500 h.
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Key words
efficiency,modules,non-halogen solvents,organic solar cells,stability
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