Diammonium-Cesium Lead Halide Perovskite with Phase-Segregated Interpenetrating Morphology for Photovoltaics

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Zhou, Ziren
Yang, Shuang
Xu, Kaixuan
Bar, Hong Wei
Xie, Jin
Lin, Zeqing
Ge, Bing
He, Jingjing
Chen, Mengjiong
Zhang, Jun
Hou, Yu
Yang, Hua Gui
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2020
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Abstract

The insertion of organic spacers into halide perovskite slabs has offered a trade-off between the efficiency and stability of perovskite solar cells (PSCs). The layered structure of diammonium-intercalated cesium lead halide perovskites is virtually unexplored, in contrast to several works on the monoammonium system. In this report, we find that perovskite with 1,4-butanediammonium (BDA) and cesium cations can only form n = 1 and n = 2 layered isologues defined by the chemical formula of (BDA)Csn-1Pbn(I0.7Br0.3)3n+1, while the n = 3-4 ones will self-construct into unique heterostructures comprising separated quantum wells (QWs; n = 1-2) and 3D (n = ∞) perovskites. We highlight that the 2D/3D heterostructures show a structural resemblance to that of bulk heterojunction in organics, thus improving the charge separation and transport more than surface passivation. Solar cells based on the (BDA)Cs3Pb4I9.1Br3.9 (n = 4) absorbing layer delivered a power conversion efficiency (PCE) reaching 9.49% with ideal light and thermal stability.

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Journal of Physical Chemistry Letters

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11

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3

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Physical sciences

Chemical sciences

Science & Technology

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Chemistry, Physical

Nanoscience & Nanotechnology

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Zhou, Z; Yang, S; Xu, K; Bar, HW; Xie, J; Lin, Z; Ge, B; He, J; Chen, M; Zhang, J; Hou, Y; Yang, HG, Diammonium-Cesium Lead Halide Perovskite with Phase-Segregated Interpenetrating Morphology for Photovoltaics, Journal of Physical Chemistry Letters, 2020, 11 (3), pp. 747-754

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