[1]benzothieno[3,2-b]benzothiophene (BTBT), with two benzene rings as the outermost rings, is referred to as diacene-fused ladder-type π-conjugated thienothiophenes. During the last three decades, derivatives based on BTBT core have been extensively studied due to their tremendous application prospects in organic field-effect transistors (OFETs) and organic optoelectronic devices. In order to further advance the development of organic electronics, new materials are constantly being synthesized and new methods are constantly evolving. This review mainly focuses on the crystal and electronic structures of BTBT derivatives, the soluble and thermal properties, the fabrication methods, as well as the strategies for performance improvement and optoelectronic applications including OFETs, photodetectors, synaptic devices, and organic light-emitting transistors. As one of the most promising organic materials, the insight into BTBT-based molecules will accelerate their potential application and provide important reference value for the development toward commercialized and industrialized organic semiconducting products.

中文翻译：

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[1]苯并噻吩[3,2-b]苯并噻吩衍生物的结构、性质和器件应用

[1]苯并噻吩并[3,2-b]苯并噻吩（BTBT）以两个苯环为最外环，被称为二苯并二苯稠合梯型π-共轭噻吩噻吩。在过去的三十年里，基于BTBT核的衍生物由于其在有机场效应晶体管（OFETs）和有机光电器件中的巨大应用前景而得到了广泛的研究。为了进一步推进有机电子学的发展，新材料不断被合成，新方法也在不断发展。本综述主要关注 BTBT 衍生物的晶体和电子结构、可溶性和热性能、制造方法以及性能改进策略和光电应用，包括 OFET、光电探测器、突触器件、和有机发光晶体管。作为最有前景的有机材料之一，对基于BTBT的分子的深入了解将加速其潜在应用，并为有机半导体产品商业化和工业化的发展提供重要的参考价值。