• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2015.11a
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• pp.265-265
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• 2015

Zinc Oxide 층은 역구조 유기 태양전지(Inverted Organic Photovoltaics, IOPV)에서 전자 수집 층으로 사용되는데, 전자 수집 및 전기 전도도 증가를 위하여 일반적으로 3차원 나노 구조체 및 양이온이 도핑된 Zinc Oxide 층이 사용된다. 본 연구에서는 저온 3차원 나노 구조체 및 음이온이 도핑된 Zinc Oxide 층을 적용하였으며, 그 결과 전자 수집 향상, 전기 전도도의 증가에 의하여 광전변환 효율(Power Conversion Efficiency, PCE)이 향상됨을 확인할 수 있었다.

• Journal of the Korean institute of surface engineering
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• v.49 no.6
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• pp.490-497
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• 2016

In this study, 3-dimensional ripple structured anion (chlorine) doped ZnO thin film are developed, and used as electron transporting layer (ETL) in inverted organic photovoltaics (I-OPVs). Optical and electrical characteristics of ZnO:Cl ETL are investigated depending on the chlorine doping ratio and optimized for high efficient I-OPV. It is found that optimized chlorine doping on ZnO ETL enhances the ability of charge transport by modifying the band edge position and carrier mobility without decreasing the optical transmittance in the visible region, results in improvement of power conversion efficiency of I-OPV. The highest performance of 8.79 % is achieved for I-OPV with ZnO:Cl-x (x=0.5wt%), enhanced ~10% compared to that of ZnO:Cl-x (x=0wt%).

• Korean Chemical Engineering Research
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• v.53 no.3
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• pp.350-356
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• 2015

The effects of the zinc oxide (ZnO) preparing process on the performance of inverted organic photovoltaic cells (OPVs) were explored. The morphology and size of ZnO nanoparticles were controlled, leading to more efficient charge collection from device and higher electron mobility compared with nanospheres. Nanosized ZnO particles were synthesized by using zinc acetate dihydrate and potassium hydroxide in methanol. Also, water was added into the reaction medium to control the morphology of ZnO nanocrystals from spherical particles to rods, and $NH_4OH$ was used to prevent the gelation of dispersion. Solution-processed ZnO thin films were deposited onto the ITO/glass substrate by using spin coating process and then ZnO films were used as an electron transport layer in inverted organic photovoltaic cells. The analyses were carried out by using TEM, FE-SEM, AFM, DLS, UV-Vis spectroscopy, current density-voltage characteristics and solar simulator.