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High-Performance Organic Solar Cells by Adding Two-Dimensional GeSe

机译：High-Performance Organic Solar Cells by Adding Two-Dimensional GeSe

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摘要

In organic solar cells (OSCs), the crystalline morphologies of the donor andacceptor at the microscale play an important role. 2D GeSe with periodicstructure and high carrier mobility is an ideal additive material for active layerof OSCs that can effectively improve the crystallinity and molecular orientationof the acceptor molecule ITIC. Here, 2D GeSe is introduced into theactive layer of OSCs to adjust the morphology of active layer for the first time,the results show that the incorporation of 2D GeSe induces the crystallizationof acceptor molecule and facilitates the formation of efficient bicontinuousinterpenetrating charge transport networks, and effectively reduces carrierrecombination in OSCs. The power conversion efficiency and lifetime ofOSCs are obviously enhanced. More importantly, the results of first-principlescalculation reveal that the interaction between 2D GeSe and ITIC guides theITIC molecules to form a continuous conductive network. This study providesa method for the morphology regulation of the donor and acceptor domainsin bulk heterojunctions, provides an idea for researching the interactionbetween 2D materials and organic molecules, and also indicates that 2DGeSe has good application prospects in photovoltaic devices.

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