Sn/Pb binary perovskite solar cells and organic amine-free perovskite solar cells

Shuzi Hayase^a, Keita Sakaguchi^a, Kosei Fujiwara^a, Koji Nishimura^a, Yuhei Ogomi^a, Qing Shen^b, Taro Toyoda^b

^aKyushu Institute of Technology, Japan, 204 Hibikino Wakamatsu-ku, Kitakyushu - Fukuoka, 808, Japan

^bThe University of Electro-communications, 1-5 Chofugaoka, Chofu, Yokyo, Japan

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Oral, Shuzi Hayase, presentation 060
Publication date: 5th February 2015

IPCE edge of Pb perovskite solar cell (MAPbI₃ solar cells, (MAPb solar cells), MA: methyl ammonium cation) is about 800nm. In order to increase the efficiency, we have to enhance open circuit voltage (Voc), short circuit current(Jsc), and fill factor(FF). We focused on the enhancement of Jsc. We calculated the relationship between Voc loss and the efficiency, and concluded that the highest efficiency is obtained by cultivating light up to 1000nm with the assumption of 0.3 Voc loss which is expected for the MAPb solar cell. We have already reported Sn/Pb(1:1) binary perovskite solar cells (MASn_0.5Pb_0.5I₃) covering up to 1040nm(1). The internal quantum efficiency of the Pb/Sn binary perovskite solar cell was high (74%) at 934 nm (Fig.1). The advantage of Pb/Sn binary perovskite solar cells is the improved stability in air, compared with Sn perovskite solar cell. We found that the binary Sn/Pb perovskite without hole transport layer has unique longer carrier life time (m second) than that of MAPb perovskite. The crystal defect of the Sn/Pb binary perovskite solar cells was compared with that of MAPb by employing Urbach energy. The Sn/Pb binary perovskite layer has higher Urbach energy (34 meV) than the MAPb perovskite layer (22 meV), suggesting that the former has larger crystal defects than the latter. We found that Sn/Pb(1:1) binary perovskite layer has gradient structures from the bottom (titania layer) to the top layer. The top layer (capping layer of perovskite layer) has lower Sn content (Sn/Pb = 0.6) than that of the bottom layer in porous titania (Sn/Pb=1.2). The long carrier life time of the binary perovskite was explained by the gradient structure in spite of the large defect density. The gradient structure is discussed from the view point of surface passivation on porous tiania by the perovskite material. Hysteresis for I-V curve is one of the unique characteristics of MAPbI₃ perovskite solar cells. Dipole of MA has been reported to be one of the causes of the hysteresis. We report photovoltaic performances and hysteresis of organic amine free-all inorganic perovskite solar cells. We concluded that hysteresis occurred for the perovskite solar cells without MA. The cause of the hyteresis is discussed.
Fig.1. Internal quantum efficiency for Sn/Pb binary perovskite solar cells coupled with P3HT hole transport layer
1. Y. Ogomi, S. Hayase, et al., J. Phys. Chem. C, 2014, 118, 16651-16659; Y. Ogomi, S. Hayase, et al., J. Phys.Chem. Lett. 2014, 5, 1004-1011; Y. Ogomi, S. Hayase et al., Chem. Phys. Chem. 2014, 15, 1062-1069.

nanoGe is a prestigious brand of successful science conferences that are developed along the year in different areas of the world since 2009. Our worldwide conferences cover cutting-edge materials topics like perovskite solar cells, photovoltaics, optoelectronics, solar fuel conversion, surface science, catalysis and two-dimensional materials, among many others.

MATSUS

Previously nanoGe Spring Meeting (NSM) and nanoGe Fall Meeting (NFM), MATSUS is a multiple symposia conference focused on a broad set of topics of advanced materials preparation, their fundamental properties, and their applications, in fields such as renewable energy, photovoltaics, lighting, semiconductor quantum dots, 2-D materials synthesis, charge carriers dynamics, microscopy and spectroscopy semiconductors fundamentals, etc.

International Conference on Hybrid and Organic Photovoltaics

International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.

Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics

The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.

International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics

The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.