利用ＬａｎｇｍｕｉｒＢｌｏｄｇｅｔ技术制备的半花菁有机分子超薄膜中存在电滞回线和热释电效应．通过电荷积分法测量其热释电系数在室温下约为１２μＣ·ｍ－２·Ｋ－１．利用偏振红外吸收光谱研究了有机超薄膜中半花菁分子取向结构随温度变化的关系．讨论了热释电性产生的微观机理 Hysteresis loops and pyroelectric effects exist in the ultrafine films of semi-cyanine organic molecules prepared by LangmuirBlodget technique. The pyroelectric coefficient was approximately 12μC · m-2 · K-1 at room temperature as measured by charge-integration method. The relationship between molecular orientation structure of semicycocyanin and temperature in organic ultrathin films was studied by means of polarized infrared absorption spectroscopy. The microscopic mechanism of pyroelectricity generation is discussed