Fehler bei der Verarbeitung der Vorlage. 
The following has evaluated to null or missing:
==> link_to_page.getData()?eval.name  [in template "20155#20195#RIBBON" at line 15, column 45]

----
Tip: It's the step after the last dot that caused this error, not those before it.
----
Tip: If the failing expression is known to legally refer to something that's sometimes null or missing, either specify a default value like myOptionalVar!myDefault, or use <#if myOptionalVar??>when-present<#else>when-missing</#if>. (These only cover the last step of the expression; to cover the whole expression, use parenthesis: (myOptionalVar.foo)!myDefault, (myOptionalVar.foo)??
----

----
FTL stack trace ("~" means nesting-related):
	- Failed at: #assign linkLabel = 'aria-label="' + ...  [in template "20155#20195#RIBBON" at line 15, column 9]
----
1<#assign contentId = .vars['reserved-article-id'].data > 
2<#assign ribbonClass = "ribbon${contentId}" > 
3<#assign bgColor = '' > 
4<#assign ribbonImage = image.getData() > 
5 
6<#assign layout = themeDisplay.getLayout()> 
7<#assign bgColor = getFieldValueFromLayoutTree(layout, "bgColor")> 
8<#assign linkLabel = ''> 
9 
10<#if validator.isBlank(ribbonImage)> 
11    <#assign ribbonImageUrl = '' > 
12<#else> 
13    <#assign ribbonImageUrl = link_to_page.getFriendlyUrl() > 
14    <#if link_to_page.getData()?has_content> 
15        <#assign linkLabel = 'aria-label="'+link_to_page.getData()?eval.name?replace('"','&quot;') + '"'> 
16    </#if> 
17</#if> 
18 
19<#if validator.isBlank(ribbonImage) > 
20    <#assign ribbonImage = getFieldValueFromLayoutTree(layout, "ribbonImage") > 
21 
22    <#if ribbonImage?has_content> 
23        <#assign ribbonImageUrl = getFieldValueFromLayoutTree(layout, "ribbonImageUrl") > 
24    </#if> 
25</#if> 
26<#if (parentStructureFieldSet20570.sourceFieldSet.source.getData())?has_content> 
27	<#assign source = parentStructureFieldSet20570.sourceFieldSet/> 
28	<#assign poster = parentStructureFieldSet20570.poster /> 
29	<#assign hideControls = parentStructureFieldSet20570.hideControls /> 
30</#if> 
31 
32 
33 
34 
35<style> 
36 
37    .${ribbonClass} .ribbon-content { 
38        aspect-ratio: 1170/${height.getData()}; 
39        background-image: url('${ribbonImage}'); 
40    } 
41 
42</style> 
43 
44<div class="hidden-phone ${ribbonClass} empa-background-color ${bgColor}"> 
45    <div class="container-xl"> 
46 
47        <#if !validator.isBlank(ribbonImageUrl)> 
48    <a href="${ribbonImageUrl}" ${linkLabel} 
49    <#else> 
50        <div 
51                </#if> 
52 
53                class="ribbon-content"> 
54            <#if source??> 
55                <#include "${templatesPath}/VIDEO-GENERIC" /> 
56            <#else> 
57                <div class="ribbon-overlay-text"> 
58                    ${overlay_text.getData()} 
59                </div> 
60            </#if> 
61 
62            <#if !validator.isBlank(ribbonImageUrl)> 
63            </a> 
64            <#else> 
65        </div> 
66        </#if> 
67    </div> 
68 
69</div> 
70 
71<#function getFieldValueFromLayoutTree layout fieldName> 
72     
73    <#attempt> 
74        <#local expandoValue = layout.getExpandoBridge().getAttribute(fieldName) /> 
75 
76        <#if (!(expandoValue?has_content) && !layout.isRootLayout())> 
77            <#return getFieldValueFromLayoutTree(layout.getAncestors()[0], fieldName)> 
78        </#if> 
79 
80        <#if expandoValue?has_content> 
81            <#return expandoValue[0]!""> 
82        <#else> 
83            <#return "" /> 
84        </#if> 
85    <#recover> 
86        <#return "" /> 
87    </#attempt> 
88 
89</#function> 

Organic NIR Colorants

We synthesize new organic dyes (cyanines) for applications in solar cells, photodetectors and light-emitting electro-chemical cells. Via chemical modification of these dyes it is possible to alter their optical properties and to optimize their redox behavior.

Due to the fact that cyanine dyes are cations, their properties can also be influenced by the choice of different counterions. In collaboration with the research group of Prof. Dr. Carlos F. O. Graeff from UNESP (São Paulo State University, Bauru, Brazil) we examined the influence of the counterions on different properties of the dyes (optical, electrochemical, thin film formation, etc.), as well as on the efficiency of organic solar cells.

A new field of research in our group is the development of efficient perovskite solar cells. These solar cells have been developed in recent years out of dye-sensitized solar cells, and their efficiencies quickly increased from 10% to over 20% (year 2016). Our goal is the development of new hole conducting materials for these solar cells.

Dyes in vials

trisphat crystal structure

Topic

Near Infrared Absorbing Colorants with Application in Light to Energy Conversion
Symmetrical Heptamethine Dye (Poster)

 

Publication

Véron A.C., Zhang H., Linden A., Nüesch F., Heier J., Hany R., Geiger T.

NIR-Absorbing Heptamethine Dyes with Tailor-Made Counterions for Application in Light to Energy Conversion

Organic Letter 16(4) (2014) 1044–1047

 

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