| 主 催 | 応用物理学会 九州支部 |
| 開催日時 | 平成27年1月10日（土）9:00-10:30 |
| 場 所 | TKP博多駅前博多駅前会議室 福岡市博多区博多駅前2-11-26 井門博多駅前ビル 2F（地図） |
| 講 師 | 早瀬修二 教授（九州工業大学） |
| 演 題 | Perovskite solar cells –Present situation and future trend |
| 概 要 | The certified efficiency of perovskite solar cell, one of printable solar cells, is now 17.9% and is reaching that of inorganic solar cells such as 20.4% of poly Si solar cells. According to our simulation, 20.4 % efficiency is obtained (IPCE:0.8 and FF:0.7) by using photo-absorber with 900nm absorption spectrum edge, when 0.3 V was taken as the voltage loss from the ideal voltage.
CH3NH3PbI3 (Perov Pb) is commonly employed as the perovskite layer.
The perovskite solar cells with porous scaffold layer/Perovskite light absorber/hole transport layers as well as with flat structures consisting of perovskite light absorber/ hole transport layers have been reported.
However, the latter has large hysteresis in I-V curves and the efficiency is controversial. How to measure the photoconversion efficiencies is now one of arguing points.
The hysteresis is not remarkably observed for perovskite solar cells with porous titania layers. High dielectric constant, dipoles, high extinction coefficient, low side band density, and low trap density are responsible for the high efficiency.
Urbach tail measured by Photo Acoustic Spectroscopy (indicator for the presence of side band density in crystals) is almost the same as that of GaAs, demonstrating high crystallinity of the Perov Pb. Efficiency enhancement up to 20%, achievement of high durability, and development of Pb free perovskite are future research items. It has been reported that photovoltaic performances for hole- transport layer-free perovskite without encapsulation did not change for 1000h under light exposure. We focused on infrared-photoconversion, because the infrared-responsible solar cells should be useful for the bottom cells of the tandem cells and for enhancing the efficiency of single cells by harvesting light up to 900 nm after the band gap tuning. We found that the mixture of Sn perovskite and Pb perovskite (CH3NH3Sn(0.5)Pb(0.5)I3, Perov Pb/Sn) has properties with improved stability under air with maintaining the photoconversion in the infrared area (up to 1060 nm). In order to increase the efficiency, porous titania was passivated by wide gap oxide thin layers such as Al2O3, ZrO2 and Y2O3. Among then, Y2O3 passivation gave the best results. Urbach tail for Perov Pb/Sn and Perov Pb is compared and the difference will be discussed. Recently, Perov Sn solar cells (Pb free perovskite solar cells) with 6.4 % efficiency have been reported. Perovskite solar cells are expected, of course, one of the next generation printable solar cells with high efficiency. Fundamental researches as well as industrial approaches are necessary before the solar cells are put into practical uses. |
| 参加費 | 無料 |
| 世話人 | 白谷 正治 九州大学大学院 システム情報科学研究院 電話: 092-802-3733，Fax: 092-802-3734 email: |
支部長 ： 原 一広（九州大学）
khara[at]nucl.kyushu-u.ac.jp
庶務幹事： 林 健司（九州大学）
hayashi[at]ed.kyushu-u.ac.jp
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