Opto-electronic properties of TiO2 nanohelices with embedded HC(NH2)2PbI3 perovskite solar cells. Issue 17 (5th December 2014)

• Record Type: Journal Article
• Authors: Lee, Jin-Wook; Lee, Seung Hee; Ko, Hyun-Seok; Kwon, Jeong; Park, Jong Hyeok; Kang, Seong Min; Ahn, Namyoung; Choi, Mansoo; Kim, Jong Kyu; Park, Nam-Gyu
• Is Part Of: Journal of materials chemistry. Volume 3:Issue 17(2015)
• Page Start: 9179
• Page End: 9186
• Publication Date: 2014-12-05
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c4ta04988h
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : A HC(NH2 )2 PbI3 perovskite solar cell based on TiO2 nanohelices has been developed. Abstract : A HC(NH2 )2 PbI3 solar cell of perovskite structure based on TiO2 nanohelices has been developed. Well-aligned helical TiO2 arrays of different pitch ( p ) and radius ( r ), helix-1 ( p /2 = 118 nm, r = 42 nm), helix-2 ( p /2 = 353 nm, r = 88 nm) and helix-3 ( p /2 = 468 nm, r = 122 nm), were grown on fluorine-doped tin oxide (FTO) glass by oblique-angle electron beam evaporation. HC(NH2 )2 PbI3 perovskite was deposited on the TiO2 nanohelices by a two-step dipping method. Helix-1 showed higher short-circuit current density ( J SC ), whereas helix-3 exhibited slightly higher open-circuit voltage ( V OC ). HC(NH2 )2 PbI3 perovskite combined with helix-1 demonstrated an average power conversion efficiency of 12.03 ± 0.07% due to its higher J SC compared to helix-2 and helix-3. The higher J SC of helix-1 could be attributed to its greater light scattering efficiency and higher absorbed photon-to-current conversion efficiency. In addition, despite having the longest pathway structure, helix-1 showed rapid electron diffusion, attributed to its higher charge injection efficiency due to the larger contact area between perovskite and TiO2 . We have established that fine tuning of the interface between perovskite and the electron-injecting oxide is a crucial factor in achieving a perovskite solar cell of high performance.