Degradation evaluation of titanium dioxide under stress factors

Ayşegül Taşçıoğlu; Gökhan Yılmaz

Makale detayları

Degradation evaluation of titanium dioxide under stress factors

Yazarlar:

Ayşegül Taşçıoğlu | Gökhan Yılmaz

Yayıncı:

Gumushane University

Ana Başlıklar:

Mühendislik

Dergi:

Gümüşhane Üniversitesi Fen Bilimleri Dergisi Vol.13 Issue 1, pp.116-126

Belge Tipi:

Makale

Yayın Tarihi:

1/2023

Belge Dili:

İngilizce

Document ID (Org No.):

2001282394

pISSN:

2146-538X

Anahtar kelimeler:

Özet:

 TiO2 is used in many sectors of industry such as health, food, defense, and energy. It is a well-known fact that TiO2 is especially used in applications in the field of organic hybrid solar cells OHSC as an electron transfer layer in the energy sector. However, the OHSCs have a degradation problem because of atmospheric stress factors such as laboratory atmosphere, prolonged light application light soaking, and UV light. To understand the metainstability problem in OHSC, it is required to be examined independently for each layer consisting of the solar cell. In this study, the TiO2 layer, widely used in OHSC applications, was grown on a rough glass substrate using a spin coating method. TiO2 layer was structurally and electrically characterized by XRD and photoconductivity methods respectively. TiO2 layer was characterized by exposure step by step to stress factors that are stated to cause electronic metainstability in organic hybrid solar cells. Mobility-lifetime products were calculated from the flux-dependent photoconductivity and correlated with the electronic defects in the material due to stress factors. The findings in experiments show the laboratory atmosphere creates surface-related defects that can be eliminated by annealing. Light soaking, UV aging, and oxygen aging also create electronic defects associated with bandgap energy positions. These defects are partially eliminated with an annealing application.

 TiO2 is used in many sectors of industry such as health, food, defense, and energy. It is a well-known fact that TiO2 is especially used in applications in the field of organic hybrid solar cells OHSC as an electron transfer layer in the energy sector. However, the OHSCs have a degradation problem because of atmospheric stress factors such as laboratory atmosphere, prolonged light application light soaking, and UV light. To understand the metainstability problem in OHSC, it is required to be examined independently for each layer consisting of the solar cell. In this study, the TiO2 layer, widely used in OHSC applications, was grown on a rough glass substrate using a spin coating method. TiO2 layer was structurally and electrically characterized by XRD and photoconductivity methods respectively. TiO2 layer was characterized by exposure step by step to stress factors that are stated to cause electronic metainstability in organic hybrid solar cells. Mobility-lifetime products were calculated from the flux-dependent photoconductivity and correlated with the electronic defects in the material due to stress factors. The findings in experiments show the laboratory atmosphere creates surface-related defects that can be eliminated by annealing. Light soaking, UV aging, and oxygen aging also create electronic defects associated with bandgap energy positions. These defects are partially eliminated with an annealing application.

 TiO2 is used in many sectors of industry such as health, food, defense, and energy. It is a well-known fact that TiO2 is especially used in applications in the field of organic hybrid solar cells OHSC as an electron transfer layer in the energy sector. However, the OHSCs have a degradation problem because of atmospheric stress factors such as laboratory atmosphere, prolonged light application light soaking, and UV light. To understand the metainstability problem in OHSC, it is required to be examined independently for each layer consisting of the solar cell. In this study, the TiO2 layer, widely used in OHSC applications, was grown on a rough glass substrate using a spin coating method. TiO2 layer was structurally and electrically characterized by XRD and photoconductivity methods respectively. TiO2 layer was characterized by exposure step by step to stress factors that are stated to cause electronic metainstability in organic hybrid solar cells. Mobility-lifetime products were calculated from the flux-dependent photoconductivity and correlated with the electronic defects in the material due to stress factors. The findings in experiments show the laboratory atmosphere creates surface-related defects that can be eliminated by annealing. Light soaking, UV aging, and oxygen aging also create electronic defects associated with bandgap energy positions. These defects are partially eliminated with an annealing application.

 TiO2 sağlık, gıda, savunma ve enerji gibi birçok sanayi sektöründe kullanılmaktadır. Özellikle organik hibrit güneş pilleri OHGP alanındaki uygulamalarda elektron transfer katmanı olarak kullanıldığı bilinmektedir. Ancak OHGP, laboratuvar atmosferi, ışıkta banyosu ve UV ışığı gibi dış stres faktörleri nedeniyle bozulma sorununa sahiptir. OHGPde kısmi-kararsızlıkkararsızlık sorununun anlaşılabilmesi için hücreyi oluşturan her tabaka için ayrı ayrı incelenmesi gerekmektedir. Bu çalışmada, OHGP uygulamalarında yaygın olarak kullanılan TiO2 tabakası pürüzlü cam taban malzeme üzerine Spin kaplama yöntemi ile büyütülmüştür. TiO2 tabakası, sırasıyla XRD ve fotoiletkenlik yöntemi ile yapısal ve elektriksel olarak karakterize edilmiştir. TiO2 tabakası, organik hibrit güneş pillerinde elektronik kısmi-kararsızlıkkararsızlık neden olduğu belirtilen stres faktörlerine birer birer maruz bırakılarak karakterize edilmiştir. Mobilite-yaşam süresi çarpımı, ışık akısına bağlı fotoiletkenlikten hesaplanmış ve stres faktörlerinden dolayı malzemedeki elektronik kusurlarla ilişkilendirilmiştir. Deneylerdeki bulgular, laboratuvar atmosferinin, tavlama ile ortadan kalkabilen yüzeyle ilgili kusurlar oluşturduğunu göstermektedir. Işık banyosu, UV yaşlanması ve oksijen yaşlanması da bant aralığı enerji konumlarıyla bağlantılı elektronik kusurlar yaratmaktadır. Tavlama uygulaması ile bu kusurlar kısmen ortadan kalkmaktadır.

Makale detayları

Degradation evaluation of titanium dioxide under stress factors

Yazarlar:

Ayşegül Taşçıoğlu | Gökhan Yılmaz

Yayıncı:

Gumushane University

Ana Başlıklar:

Mühendislik

Dergi:

Gümüşhane Üniversitesi Fen Bilimleri Dergisi Vol.13 Issue 1, pp.116-126

Belge Tipi:

Makale

Yayın Tarihi:

1/2023

Belge Dili:

İngilizce

Document ID (Org No.):

2001282394

pISSN:

2146-538X

Electronic degradation

Mobility-lifetime product

Photoconductivity

Spin coating

Stress factors

Titanium dioxide.

Elektronik bozunma

Mobilite-yaşam süresi çarpımı

Fotoiletkenlik

Spin kaplama

Stres faktörleri

Titanyum dioksit.

Sayı

Makale detayları

Yazarlar: Ayşegül Taşçıoğlu | Gökhan Yılmaz

Yayıncı: Gumushane University

Ana Başlıklar: Mühendislik

Dergi: Gümüşhane Üniversitesi Fen Bilimleri Dergisi Vol.13 Issue 1, pp.116-126

Belge Tipi: Makale

Yayın Tarihi: 1/2023

Belge Dili: İngilizce

Document ID (Org No.): 2001282394

pISSN: 2146-538X

Sayı

Yazarlar:

Ayşegül Taşçıoğlu | Gökhan Yılmaz

Yayıncı:

Gumushane University

Ana Başlıklar:

Mühendislik

Dergi:

Gümüşhane Üniversitesi Fen Bilimleri Dergisi Vol.13 Issue 1, pp.116-126

Belge Tipi:

Makale

Yayın Tarihi:

1/2023

Belge Dili:

İngilizce

Document ID (Org No.):

2001282394

pISSN:

2146-538X