Wang Yaping, Shi Zhenzhen, Liu Hao, Wang Fuzhi, Bai Yiming, Bian Xingming, Zhang Bing, Hayat Tasawar, Alsaedi Ahmed, Tan Zhan'ao
State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China.
Department of Mathematics, Quiad-I-Azam University, Islamabad 44000, Pakistan.
Polymers (Basel). 2017 Nov 3;9(11):571. doi: 10.3390/polym9110571.
Due to the inhomogeneous distribution of donor and acceptor materials within the photoactive layer of bulk heterojunction organic solar cells (OSCs), proper selection of a conventional or an inverted device structure is crucial for effective exciton dissociation and charge transportation. Herein, we investigate the donor and acceptor distribution within the non-fullerene photoactive layer based on PBDTTT-ET:IEICO by time-of-flight secondary-ion mass spectroscopy (TOF-SIMS) and scanning Kelvin probe microscopy (SKPM), indicating that more IEICO enriches on the surface of the photoactive layer while PBDTTT-ET distributes homogeneously within the photoactive layer. To further understand the effect of the inhomogeneous component distribution on the photovoltaic performance, both conventional and inverted OSCs were fabricated. As a result, the conventional device shows a power conversion efficiency (PCE) of 8.83% which is 41% higher than that of inverted one (6.26%). Eventually, we employed nickel oxide (NiO) instead of PEDOT:PSS as anode buffer layer to further enhance the stability and PCE of OSCs with conventional structure, and a promising PCE of 9.12% is achieved.
由于体异质结有机太阳能电池（OSC）光活性层内供体和受体材料的分布不均匀，正确选择传统或倒置器件结构对于有效的激子解离和电荷传输至关重要。在此，我们通过飞行时间二次离子质谱（TOF-SIMS）和扫描开尔文探针显微镜（SKPM）研究了基于PBDTTT-ET:IEICO的非富勒烯光活性层内的供体和受体分布，结果表明更多的IEICO富集在光活性层表面，而PBDTTT-ET在光活性层内均匀分布。为了进一步了解不均匀成分分布对光伏性能的影响，制备了传统和倒置的OSC。结果，传统器件的功率转换效率（PCE）为8.83%，比倒置器件（6.26%）高41%。最终，我们采用氧化镍（NiO）代替PEDOT:PSS作为阳极缓冲层，以进一步提高传统结构OSC的稳定性和PCE，并实现了9.12%的可观PCE。
