Photodetector's performances can be effectively enhanced by utilizing the polarization charges generated at the local interface through the light-self-induced pyro-phototronic effect. In order to efficiently take advantage of the polarization charges of both polarities, here a tri-layer heterojunction consisting of one pyroelectric semiconductor ZnO nanowire and other two conventional semiconductors is prepared and its response characteristics to 648 nm laser illuminations are studied. The photocurrents at all the illuminant powers are significantly improved by the pyro-phototronic effect. At illuminant power of 0.04 mW, the responsivity is improved from 0.823 to 22.054 mA/W. Moreover, the effect of chopper frequency has been studied, showing that with the increase of chopper frequency, the photocurrent as well as responsivity first increases and then gradually saturates. Specifically, the responsivity at a chopper frequency of 400 Hz is nearly four times as large as that at 10 Hz, indicating possible applications in ultrafast pulsed light detection. In addition, the intermediate ZnO nanowire layer has been modulated to investigate its influence on the pyro-phototronic effect in this kind of tri-layer heterojunction devices. The results conclude that short ZnO nanowire layer is preferred as the intermediate layer for better pyro-phototronic effect improved device performances. At last, a visible light communication system using the tri-layer heterojunction device is demonstrated, successfully transmitting and decrypting the sent signal. This work provides deep understandings of the physical working mechanisms of the pyro-phototronic effect in tri-layer heterojunction devices, and also exhibits the huge potential of the tri-layer heterojunction devices in high performance photodetection and light communication.

通过利用光自感应的热释光效应在局部界面产生的极化电荷，可以有效地提高光电探测器的性能。为了有效利用两个极性的极化电荷，在此制备了由一个热电半导体ZnO纳米线和其他两个常规半导体组成的三层异质结，并研究了其对648 nm激光照射的响应特性。热释电效应大大改善了所有光源的光电流。在0.04 mW的发光功率下，响应度从0.823提高到22.054 mA / W。此外，研究了斩波频率的影响，表明随着斩波频率的增加，光电流和响应度首先增加，然后逐渐饱和。具体而言，斩波频率为400 Hz时的响应度几乎是10 Hz时的响应度的四倍，这表明它可能在超快脉冲光检测中应用。此外，已经对中间ZnO纳米线层进行了调制，以研究其对此类三层异质结器件中热释光电子效应的影响。结果表明，较短的ZnO纳米线层优选作为中间层，以更好的热释光效应改善器件性能。最后，展示了使用三层异质结器件的可见光通信系统，该系统成功地发送和解密了发送的信号。