PbS/CH3NH3PbI3 Sensitized Quantum dot solar cells Based on efficient charge extracting Nanorods

Gabseok Seo^a, Tae Kyu Ahn^a

^aSungkyunkwan Univ, KRICT, 83205, Research complex 2 , Sungkyunkwan University, Suwon, gyunggi-do, S.korea, 440746, Korea, Republic of

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

Poster, Gabseok Seo, 314
Publication date: 5th February 2015

Semiconductor quantum dots (QDs) have received great attention as a solar energy material due to a high extinction coefficient, tunable band gap, easy production, large dipole moment and multiple exciton generation (MEG) effect. Among them, PbS is one of most explored materials in QD solar cells because of a broad light harvesting from the visible to the infrared (IR) range by easily adjusting QD sizes. Recently, it was reported that lead halide perovskite materials (CH₃NH₃PbX₃, X=Cl, Br, I) possess a high carrier mobility and long carrier diffusion length. Herein, we report fast charge extracting template TiO₂ nanorod (NRs) electrode with directly attached PbS QDs/CH₃NH₃PbI₃Core/Shell-sensitizer. The successive ionic layer adsorption and reaction (SILAR) application of a PbI₂ and Na₂S solution on mesoporous TiO₂ electrode by repeating spin-coating and the subsequent dipping into CH₃NH₃I solution in a final stage enabled the formation of CH₃NH₃PbI₃-capped PbS QDs. Then, hole transporting polymers (P3HT and PEDOT:PSS) were also spin-coated and an Au counter electrode was deposited by thermal evaporation to complete the device. The resulting device showed a fully filled with PbS QDs/CH₃NH₃PbI₃sensitized solar cell reaching overall efficiency to 4.1% under simulated solar illumination (AM1.5, 100 mW·cm^-2). (See Figure as below)
Figure 1 Solar cell performance of PbS quantum dots and enclosed in situ with Perovskite thin layer
[1] Julian Burschka, Norman Pellet, Soo-Jin Moon, Robin, Hymphry-Baker, Peng Gao, Mohammad K. Nazeeruddin , Michael Gratzel. Sequential deposition as a route to high-performance perovskite-sensitized solar cells. Nature. 2013, 499, 316-319 [2] Sang Hyuk Im, Hi-Jung Kim, Sungwoo Kim, Sang-Wook Kim, Sang Il Seok. Organic Electronics 2012, 13, 2352-2357 [3] Jin Hyuk Heo, Sang Hyuk Im, Jun Hong Noh, Tarak N. Mandal, Choong-Sun Lim, Jeong Ah Chang, Yong Hui Lee, Hi-Jung Kim, Arpita Sarkar, Md. K. Nazeeruddin, Michael Gratzel, Sang Il Seok, Nature Photonics 2013, 7, 486,491

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