Three Dimensional Solar Cells Based on Optical Confinement Geometries by Yuan Li

Author:Yuan Li
Language: eng
Format: epub
Publisher: Springer New York, New York, NY

(4.1)

By means of Eq. 4.1, the energy absorption in each layer could be worked out, and their ratio A i (layer i = 1, 2, …m) to is independent with incident light intensity, shown in Eq. 4.2. Thus, for fast calculation, this ratio is helpful to find the energy absorption in certain layer via iterative multi-reflected propagation in fiber chamber.

(4.2)

Figure 4.1c represents the process that light enters into fiber and reflects many times. The materials including air, fiber, transparent anode, hole transport layer, active layer, electron transport layer, and cathode, which are numbered as 0, 1, 2, …i, …, and m successively, where a represents the active layer. The ray tracing method [7, 8] is used to calculate the position and the angle of each reflection. However, since the fiber cannot bend over short scale, it is reasonable to assume the incident angles at each reflection are same, i.e. θ i  = constant. At the first reflection as shown in Fig. 4.1c, the light absorption from active layer in stacked films could be written as Eq. 4.3.

Fig. 4.1(a) Schematic diagram of light entering into fiber-based solar cell. (b) Image of the fiber-based solar cell device. (c) Light incidence and propagation in fiber. At position (x 0 , y 0 ), sunlight enters into fiber (diameter d) from the left side with incident angle θ 0 . Light reflects on inner surface of fiber with incident angle θ 1 . The reflectance and transmittance factors between fiber and stacked multi-layer are R m , T m in Eqs. 1.17 and 1.18. l = d/sin(θ 1 ) is the optical path between two reflections

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