Design of color tunable thin film polymer solar cells for photovoltaics printing

Color tunable thin film polymer solar cells have demonstrated the potentials of a wide applications in photovoltaics printing, which is significant for ink pollution reduction and energy saving. This work presents a new effective approach to realize color-tuning photovoltaic cells with optical microcavity structures. Aluminum-doped zinc oxide is utilized as electron transport layer material. With its high electrical conductivity, the thickness tuning range can be quite large, which means the cavity length has a wide variation range. It thus provides sufficient space for optical thin film design to obtain multi colors. By the transfer matrix method, device reflection and absorption spectra are numerically investigated. Based on that, the optical principles for color tunability are explored. In further step, the relationship between device photovoltaics performance and reflective colors are also discussed. Finally, the color coordinates and luminosities are calculated. As results, the colors of the devices designed are capable to cover a relatively large region in Commission Internationale de l′Eclairage(CIE) 1931 x, y chromaticity diagram, which is available to be integrated into the advertisement poster boards, building wall printing and other display applications.

用于激光锁频的低泵浦场饱和吸收光谱（英文）

目的:利用激光透过原子气室时的端面反射产生泵浦光,实现低泵浦场的饱和吸收光谱,提高饱和吸收光谱锁频方法对运动平台的适应性。创新点:1.在饱和吸收光谱中实现无需额外反射镜调节的泵浦光与探测光的重合方法;2.在饱和吸收光谱中实现强探测-弱泵浦的实验方式。方法:1.利用原子气室端面反射光作为泵浦光,实现低泵浦场的饱和吸收光谱装置(图1和2);2.研究实现低泵浦场的饱和吸收光谱所需的角度控制精度(图4);3.研究采用此方法的激光频率锁定效果(图5和6)。结论:1.低泵浦场的饱和吸收光谱方法可以满足激光频率锁定的要求;2.低泵浦场的饱和吸收光谱装置相比传统装置,没有多余的可调节的反射镜,装置更加简洁,锁频效果受环境影响更小,对运动平台的适应性更强。