Critical light instability in CB/DIO processed PBDTTT-EFT:PC71BM organic photovoltaic devices

被引:86
作者
Pearson, Andrew J. [1 ]
Hopkinson, Paul E. [1 ,2 ,3 ]
Couderc, Elsa [1 ]
Domanski, Konrad [1 ,4 ]
Abdi-Jalebi, Mojtaba [1 ]
Greenham, Neil C. [1 ]
机构
[1] Univ Cambridge, Cavendish Lab, JJ Thomson Ave, Cambridge CB3 0HE, England
[2] Heidelberg Univ, Ctr Adv Mat, D-69120 Heidelberg, Germany
[3] Heidelberg Univ, Kirchhoff Inst Phys, D-69120 Heidelberg, Germany
[4] Swiss Fed Inst Technol, Dept Chem & Chem Engn, Lab Photon & Interfaces, Stn 6, CH-1015 Lausanne, Switzerland
基金
英国工程与自然科学研究理事会;
关键词
PBDTTT-EFT; PC71BM; OPV; Lifetime; Solar; Instability; POLYMER SOLAR-CELLS; OPEN-CIRCUIT VOLTAGE; HIGH-PERFORMANCE; EFFICIENCY; MORPHOLOGY; ADDITIVES; RECOMBINATION; OXYGEN; LAYER;
D O I
10.1016/j.orgel.2015.12.024
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Organic photovoltaic (OPV) devices often undergo 'burn-in' during the early stages of operation, this period describing the relatively rapid drop in power output before stabilising. For normal and inverted PBDTTT-EFT:PC71BM OPVs prepared according to current protocols, we identify a critical and severe light-induced burn-in phase that reduces power conversion efficiency by at least 60% after 24 hours simulated AM1.5 illumination. Such losses result primarily from a reduction in photocurrent, and for inverted devices we correlate this process in-situ with the simultaneous emergence of space-chare effects on the ms timescale. The effects of burn in are also found to reduce the lifetime of photogenerated charge carriers, as determine by in-situ transient photovoltage measurements. To identify the underlying mechanisms of this instability, a range of techniques are employed ex-situ to separate bulk-and electrode-specific degradation processes. We find that whilst the active layer nanostructure and kinetics of free charge generation remain unchanged, partial photobleaching (6% of film O.D.) of PBDTTT-EFT:PC71BM occurs alongside an increase in the ground state bleach decay time of PBDTTT-EFT. We hypothesise that this latter observation may reflect relaxation from excited states on PBDTTT-EFT that do not undergo dissociation into free charges. Owing to the poor lifetime of the reference PBDTTT-EFT: PC71BM OPVs, the fabrication protocol is modified to identify routes for stability enhancement in this initially promising solar cell blend. (C) 2016 The Authors. Published by Elsevier B.V.
引用
收藏
页码:225 / 236
页数:12
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