In organic solar cells (OSCs), changing the device geometry and the photophysical properties of the active layer is an effective way to change the power conversion efficiency (PCE). For this purpose, both the buffer layer was coated between the active layer and the metal and the organic material was doped to the active layer to obtain the ternary structure. In this study, for the fabrication of bulk-heterojunction (BHJ) organic solar cell, the PEDOT:PSS layer was coated on chemically cleaned ITO coated glass substrates by the spin coating method. Subsequently, the P3HT:PCBM blend as an active layer was coated on top of PEDOT:PSS in the glove box using the same method. Finally, aluminum (Al) was coated using thermal evaporation and ITO/PEDOT:PSS/P3HT:PCBM/Al organic solar cells structure as reference device were obtained. Then, PENTACENE material with an organic semiconductor property was doped into P3HT:PCBM blend and ITO/PEDOT:PSS/P3HT:PCBM:PENTACENE/Al bulk heterojunction organic solar cell structure was obtained using the same method. In addition, the effects of OSC on PCE were investigated by coating the 2 nm lithium fluoride layer between the Al and the active layer. For devices, dark and light current density-voltage (J-V) measurements were performed under 100 mW/cm² in the glove box, and device parameters were calculated by the J-V curve. It was observed that the reference device showed photovoltaic properties under light and its PCE was 0.64%. When the experimental findings obtained were examined, both the LiF buffer layer and PENTACENE doping material improved the ternary OSC device performance and increased the PCE from 0.64% to 2.65%, according to the reference device. As a result of the doping, the mobility of the carrier increased with the increase of photon absorption and the presence of the buffer layer increased the carrier injection. Changing device properties can be explained with these results.

在有机太阳能电池（OSC）中，更改器件几何形状和有源层的光物理特性是更改功率转换效率（PCE）的有效方法。为此目的，在活性层和金属之间都涂覆缓冲层，并且将有机材料掺杂到活性层中以获得三元结构。在这项研究中，为制造体异质结（BHJ）有机太阳能电池，通过旋涂法将PEDOT：PSS层涂在化学清洁的ITO涂层玻璃基板上。随后，使用相同的方法将P3HT：PCBM共混物作为活性层涂覆在杂物箱中的PEDOT：PSS顶部。最后，使用热蒸发法涂覆铝（Al），并获得ITO / PEDOT：PSS / P3HT：PCBM / Al有机太阳能电池结构作为参考器件。然后，将具有有机半导体特性的五元共聚物材料掺入P3HT：PCBM混合物中，并使用相同的方法获得ITO / PEDOT：PSS / P3HT：PCBM：五元共聚物/ Al本体异质结有机太阳能电池结构。此外，通过在Al和活性层之间涂覆2 nm氟化锂层，研究了OSC对PCE的影响。对于设备，在100 mW / cm的条件下执行了暗电流和亮电流密度-电压（JV）测量²在手套箱中，并通过合资曲线计算设备参数。观察到参考装置在光下显示出光伏性质，并且其PCE为0.64％。根据参考设备，对获得的实验结果进行检查时，LiF缓冲层和PENTACENE掺杂材料均改善了三元OSC器件性能，并使PCE从0.64％提高到2.65％。掺杂的结果是，载流子的迁移率随光子吸收的增加而增加，并且缓冲层的存在增加了载流子的注入。使用这些结果可以解释更改设备属性。