https://scholars.lib.ntu.edu.tw/handle/123456789/415799
Title: | Reconciling the value of Schottky barriers in small molecular organic photovoltaics from J-V and C-V measurements at low temperatures towards the estimation of open circuit voltage at 0 K | Authors: | Biring, S. Sung, Y.-M. Nguyen, T.P. Li, Y.-Z. Lee, C.-C. Yi Chan, A.H. Pal, B. Sen, S. Liu, S.-W. Wong, K.-T. |
Keywords: | CV; DTDCPB:C70; Inhomogeneous Schottky barriers; J-V; Low temperature; Open circuit voltage | Issue Date: | 2019 | Journal Volume: | 73 | Start page/Pages: | 166-171 | Source: | Organic Electronics: physics, materials, applications | Abstract: | Open circuit voltage of a photovoltaic system, in general, is constrained by the Schottky barrier (SB) heights formed at the electrodes. Here, the SB heights which are inhomogeneous in nature at the anode-semiconductor junction of a donor-acceptor-acceptor molecule, 2-[(7-(4-[N,N-bis(4-methylphenyl)amino]phenyl)-2,1,3-benzothia-diazol-4-yl)methylene] propane-dinitrile (DTDCPB), mixed with C70 as a bulk heterojunction have been studied thoroughly by inserting an insulating layer of MoO3 with different thicknesses (6 nm, 12 nm, 18 nm) and measuring the current density-voltage (J-V) and capacitance-voltage (C–V) characteristics of the photovoltaics under a large temperature range of 100K–300 K for proper estimation of open circuit voltage (Voc). Experimental results reveal a linear inverse temperature dependence of SB heights in the whole temperature range. The mismatch in the extracted values of SB heights from the independent measurements of J-V and C–V vanishes under the consideration of non-linear temperature dependence of built-in potential (Vbi) leading to the legitimate prediction of Voc. © 2019 Elsevier B.V. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85067809082&doi=10.1016%2fj.orgel.2019.06.014&partnerID=40&md5=1443ccbb42dd15e78ea9ffcfaadd9c58 https://scholars.lib.ntu.edu.tw/handle/123456789/415799 |
DOI: | 10.1016/j.orgel.2019.06.014 | SDG/Keyword: | Capacitance; Electrodes; Heterojunctions; Molybdenum oxide; Photovoltaic cells; Schottky barrier diodes; Temperature distribution; Timing circuits; Bulk heterojunction; DTDCPB:C70; Independent measurement; Inverse temperatures; Low temperatures; Organic photovoltaics; Photovoltaic systems; Schottky barriers; Open circuit voltage |
Appears in Collections: | 化學系 |
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