In this report, the effects of photoactive blend compositions, film thicknesses, and annealing conditions on the P3HT:PC₇₀BM solar cells performance and reproducibility was investigated. The performance of prepared devices was described by examining their absorption spectra, current-voltage characteristics and external quantum efficiency (EQE). The thickness of active layer was achieved as 190 nm, 125 nm, and 90 nm, by maintaining the spin speed. Current density (J_sc) slightly increases from 6.39 to 7.15 mA/cm² with increase in thickness from 90 to 125 nm; however, with further increase in film thickness (190 nm), the J_sc was reduced to 4.39 mA/cm². To optimize the device performance, four different compositions of PC₇₀BM (1:0.6, 1:0.8, 1:1, and 1:12) were investigated at the most favorable film thickness ~ 125 nm. The effect of different PC₇₀BM compositions on photovoltaic performance was demonstrated by X-ray diffraction (XRD) and Raman measurements that illuminated modification in structural properties. Additionally, annealing condition led to achieve the good phase separation for efficient charge separation and transport within P3HT: PCBM film which further leads to increased efficiency (PCE ~ 3.31%). These effects deliver valued facts for the choices of PC₇₀BM amount in P3HT:PC₇₀BM system, and this efficient device optimization might be useful in other efficient photovoltaic systems for better performance through excellent reproducibility.

Graphical Abstract

在此报告中，研究了光活性共混物的组成，膜厚度和退火条件对P3HT：PC ₇₀ BM太阳能电池性能和可重复性的影响。通过检查吸收光谱，电流-电压特性和外部量子效率（EQE）来描述所制备器件的性能。通过保持旋转速度，有源层的厚度达到190nm，125nm和90nm。电流密度（J _sc）从6.39mA / cm ²略微增加到7.15mA / cm ²，厚度从90nm增加到125nm；但是，随着膜厚（190 nm）的进一步增加，J _sc降低至4.39 mA / cm ^2。。为了优化器件性能，研究了PC ₇₀ BM的四种不同成分（1：0.6、1：0.8、1：1和1:12），最有利的膜厚约为125 nm。通过X射线衍射（XRD）和拉曼测量证实了不同PC ₇₀ BM组合物对光伏性能的影响，这些结果阐明了结构性能的变化。此外，退火条件导致在P3HT：PCBM膜内实现有效的电荷分离和传输的良好相分离，从而进一步提高了效率（PCE〜3.31％）。这些效果为选择P3HT：PC _70中的PC ₇₀ BM量提供了有价值的事实。BM系统以及这种有效的设备优化功能可能在其他高效的光伏系统中很有用，可通过出色的可重复性获得更好的性能。

图形概要