The 66th JSAP Spring Meeting, 2019

Presentation information

Oral presentation

12 Organic Molecules and Bioelectronics » 12.5 Organic solar cells

[11a-S221-1~12] 12.5 Organic solar cells

Mon. Mar 11, 2019 9:00 AM - 12:15 PM S221 (S221)

Tetsuhiko Miyadera(AIST), Shuji Hayase(Kyushu Inst. of Tech.)

10:45 AM - 11:00 AM

[11a-S221-7] 【Highlight】Reduced strain by cesium addition leading to the improvement in the efficiency of tin-lead mixed perovskite solar cells

〇(PC)Gaurav Kapil1,2, Takeru Bessho1, Chi Huey Ng2, Kengo Hamada2, Takumi Kinoshita1, Qing Shen3, Taro Toyoda3, Takurou N. Murakami4, Hiroshi Segawa1, Shuzi Hayase2 (1.The Univ. of Tokyo, 2.Kyu. Inst. of Tech., 3.Uni. of Elec. Comm., 4.AIST)

Keywords:Perovskite solar cell, tin-lead, high efficiency

Tin-lead (Sn-Pb) perovskite solar cells (PSCs) can attain higher power conversion efficiency (PCE) than pure Pb based PSCs, owing to their ideal band gap (1.2 eV-1.4 eV) according to the Shockley-Queisser (SQ) limit [1,2]. However, being a low band gap material and prone to oxidation of Sn2+ to Sn4+, Sn-Pb solar cells suffer from voltage loss (VL). To decrease the VL, we have already introduced a spike like structure which led to a PCE of 17.6% [3]. To further decrease VL, in this work we demonstrate that Cesium ion (Cs+) incorporation into the lattice of Sn-Pb absorbers can relax the strained lattice. As a result, open circuit voltage (Voc) more than 0.8 V and PCE more than 20% was obtained.
References
1. D. Zhao & Y. Yan et al, Nat. Energy., 2017, 2, 1-7.
2. W. Shockley, H. J. Queisser, J. Appl. Phys. 1961, 32, 510.
3. G. Kapil and S. Hayase et al., Nanoletters, 2018, 18, 3600-3607.