成果報告書詳細
管理番号20160000000672
タイトル*平成27年度中間年報 次世代材料評価基盤技術開発 研究開発項目(2)有機薄膜太陽電池材料の評価基盤技術開発
公開日2016/9/28
報告書年度2015 - 2015
委託先名次世代化学材料評価技術研究組合
プロジェクト番号P10029
部署名材料・ナノテクノロジー部
和文要約
英文要約Title : Development of basic evaluation technologies for future generation materials / R&D items [2] Development of basic evaluation technologies for materials used in the fabrication of organic thin film photovoltaic devices

The major target of this project is to develop evaluation technologies for chemical materials used in the fabrication of thin film organic photovoltaic (OPV) devices. “Standard organic thin film solar cells and devices” are required to establish standard evaluation technologies. A standard device is defined as a standard solar cell with encapsulation. The mid-term target of this project until the end of the FY2015 is to complete the formation technology of standard cells. In addition to the standard devices on glass substrates we will develop devices on flexible film substrates. The candidate structures of typical OPV standard devices are categorized into a bulk hetero-junction type, a vacuum evaporation type and a perovskite type.
In the fiscal 2015, we established reproducible technologies for the fabrication of two bulk heterojunction solar cells with conversion efficiency of more than 5% for the inverse configuration and 7% or more for the small molecule standard solar cell by vapor deposition, and for the fabrication of widely researched perovskite (MAPbI3) standard solar cell on glass substrate with the average efficiency of 10% or more. For the Pb-free perovskite solar cell device we have investigated Sn-based and Bi-based devices. Concerning flexible substrate, we have achieved initial conversion efficiency of 8% for the bulk heterojunction and for the perovskite solar cell devices.
As for the oxygen transmission rate (OTR) measurement of barrier films, we have demonstrated that although the OTR at the room temperature was near or below the detection limit of the OTR measurement instrument, it nevertheless can be estimated by extrapolation of high temperature measurements to the room temperature.
Towards the international standardization we have obtained the basic data for solar cell under indoor light condition and informed them to the Nano-electronics Standardization Technical Committee under Japan Electronics and Information Technology Industries Association (JEITA) to contribute the creation of the JEITA standardization.
We successfully conducted evaluation of electronic states at the p-n junction interface of the Pb-based perovskite thin film solar cells fabricated by evaporation method by using a combination of energy levels measurement techniques, such as ultraviolet photoelectron spectroscopy (UPS), inverse photoemission spectroscopy (IPES) and Kelvin probe (KP). In addition, our analysis of differences between the thermally stimulated current (TSC) spectra measured before and after light-induced degradation confirmed that the variation of charged trap states occurs depending on the light irradiation.
Also, we examined the change of carrier dynamics in the P3HT:ICBA-based bulk heterojunction standard cell due to photodegradation with the help of transient absorption spectroscopy accompanied with the transient photovoltaic-photocurrent measurement method. We have found that the photodegradation was mainly caused by the generation of charge traps in the P3HT amorphous phase that affected transport and extraction of charges, which in turn reduced the short circuit current density and the fill factor. Moreover, the recombination of charges through the trap energy levels has been found to reduce the open circuit voltage.
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