Study On The Effects Of Space Charges In Organic Optoelectronic Devices

In spite of high optoelectronic conversion efficiency, high cost and complicated fabrication processes prevent inorganic-based optoelectronic device from broad commercial applications. On the contrary, organic semiconductor materials with the advantages of easy fabrication, low cost and lightweight have received considerable attention, though a slow progress due to low carrier mobility and instability.Firstly, the progress of organic solar cells and two types of the current organic solar cells were reviewed. Prospects were introduced as well. Effects of space charges on photocurrent were studied in the photocells with a structure of metal/insulator/semiconductor/metal (MISM) proposed by my supervisor. A model system ITO/PVDF (1μm) / ZnPc: C60 (30 nm) / Al devices was fabricated and studied. For comparison, theoretic analyses based on dielectric physics theory were performed. Theoretic simulations by using ORINGIN V8.1 were subsequently carried out for the photocurrent. It was found that both the theoretic and experimental data fit well with each other, suggesting that our theoretic derivations are reasonable and useful for further experiments.The results in the paper can be utilized for the analysis of effects of space charges on transient photocurrent in organic optoelectronic devices, which means potentials for applications or controlling of the space charges. The MISM structure fabricated by other materials may also exhibit the similar photocurrent behavior in our studies.