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Title: Improved photovoltaic efficiency and amplified photocurrent generation in mesoporous n = 1 two-dimensional lead – iodide perovskite solar cells
Authors: Febriansyah, Benny
Koh, Teck Ming
Lekina, Yulia
Nur Fadilah Jamaludin
Bruno, Annalisa
Ganguly, Rakesh
Shen, Ze Xiang
Mhaisalkar, Subodh Gautam
England, Jason
Keywords: Science::Chemistry::Inorganic chemistry
Issue Date: 2019
Source: Febriansyah, B., Koh, T. M., Lekina, Y., Nur Fadilah Jamaludin, Bruno, A., Ganguly, R., . . . England, J. (2019). Improved photovoltaic efficiency and amplified photocurrent generation in mesoporous n = 1 two-dimensional lead – iodide perovskite solar cells. Chemistry of Materials, 31(3), 890-898. doi:10.1021/acs.chemmater.8b04064
Journal: Chemistry of Materials
Abstract: We utilized two organic dications containing, respectively, a pyridinium and an imidazolium core to construct new n = 1 (where n refers to the number of contiguous two-dimensional (2D) inorganic layers, i.e., not separated by organic cations) 2D lead–iodide perovskites 1 and 2. The former material exhibits a (100)- and the latter a very rare 3 × 3 (110)-structural type. Compared with primary ammonium functionality, their constituent ring-centered positive charges have lower charge density. As a result, [PbI6]4– interoctahedral distortions of the inorganic lattice in 1 and 2 are reduced (Pb–I–Pb bond angles are as high as 166° and 174°, respectively). This results in bathochromically shifted optical features. In addition, the compact nature of the dications produces extremely short lead–iodide sheet separations, with respective iodide–iodide (I···I) distances as small as 4.149 and 4.278 Å. These are among the shortest separations of adjacent lead–iodide layers ever reported for such materials. When crystallized as thin films on top of substrates, the resulting 2D perovskite layers do not adopt a regular growth direction parallel to the surface. Instead, the crystallites grow with no fixed orientation. As a consequence of their proximate inorganic distances and unusual crystallization tendencies, the resulting 2D perovskites exhibit low excitonic activation energies (93.59 and 96.53 meV, respectively), enhanced photoconductivity in solar cells, and unprecedented incident photon-to-current conversion rates of up to 60%. More importantly, mesoporous 2D layered perovskite solar cells with power conversion efficiencies of 1.43 and 1.83% were achieved for 1 and 2, respectively. These are the highest values obtained thus far for pure n = 1 lead–iodide perovskites and more than 20 times higher than those obtained for materials templated by more conventional cations such as phenylethylammonium (0.08%).
ISSN: 0897-4756
DOI: 10.1021/acs.chemmater.8b04064
DOI (Related Dataset):
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Chemistry of Materials, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
Fulltext Permission: open
Fulltext Availability: With Fulltext
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