chemistry

Tin(II) sulfide

Tin(II) sulfide is a chemistry topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Tin(II) sulfide rather than just read about it. In short: Tin(II) sulfide is an inorganic compound with the chemical formula is SnS. A black or brown solid, it occurs as the rare mineral herzenbergite (α-SnS).It is insoluble in water but dissolves with degradation in concentrated hydrochloric acid.

Key takeaways

Tin(II) sulfide belongs to chemistry; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Tin(II) sulfide to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Tin(II) sulfide from memory before moving on to harder problems.

Reference excerpt

Tin(II) sulfide is an inorganic compound with the chemical formula is SnS. A black or brown solid, it occurs as the rare mineral herzenbergite (α-SnS).It is insoluble in water but dissolves with degradation in concentrated hydrochloric acid. Tin(II) sulfide is insoluble in ammonium sulfide.

Synthesis The preparation of tin(II) sulfide has been extensively investigated, and the direct reaction of the elements is inefficient. Instead, molten potassium thiocyanate reliably reacts with stannic oxide to give SnS at 450 °C:

SnO2 + 2 KSCN → SnS + K2S + 2CO + N2 SnS also forms when aqueous solutions of tin(II) salts are treated with hydrogen sulfide. This conversion is a step in qualitative inorganic analysis. At cryogenic temperatures, stannous chloride dissolves in liquid hydrogen sulfide. It then decomposes to the sulfide, but only slowly.

Structure At temperatures above 905 K, SnS undergoes a second order phase transition to β-SnS (space group: Cmcm, No. 63). A new polymorph of SnS exists based upon the cubic crystal system, known as π-SnS (space group: P213, No. 198). Herzenbergite (α-SnS) can be exfoliated to form layered structure similar to that of black phosphorus, featuring 3-coordinate Sn and S centers. Analogous to black phosphorus, tin(II) sulfide can be ultrasonically exfoliated in liquids to produce atomically thin semiconducting SnS sheets that have a wider optical band gap (>1.5 eV) compared to the bulk crystal.

Photovoltaic applications Tin(II) sulfide has been evaluated as a candidate for thin-film solar cells. Currently, both cadmium telluride and CIGS (copper indium gallium selenide) are used as p-type absorber layers, but they are formulated from toxic, scarce constituents. Tin(II) sulfide, by contrast, is formed from cheap, earth-abundant elements, and is nontoxic. This material also has a high optical absorption coefficient, p-type conductivity, and a mid range direct band gap of 1.3-1.4 eV, required electronic properties for this type of absorber layer. Based on the a detailed balance calculation using the material bandgap, the power conversion efficiency of a solar cell utilizing a tin(II) sulfide absorber layer could be as high as 32%, which is comparable to crystalline silicon. Finally, Tin(II) sulfide is stable in both alkaline and acidic conditions. All aforementioned characteristics suggest tin(II) sulfide as an interesting material to be used as a solar cell absorber layer. Power conversion efficiencies for tin(II) sulfide thin films in photovoltaic cells are less than 5%. Barriers for use include a low open circuit voltage and an inability to realize many of the above properties due to challenges in fabrication.

References

Worked examples

Example 1 — a first encounter with Tin(II) sulfide

Start with the simplest possible case. Write down what Tin(II) sulfide claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In chemistry, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Tin(II) sulfide before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Tin(II) sulfide ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Tin(II) sulfide

In research: Tin(II) sulfide appears in chemistry research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Tin(II) sulfide in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Tin(II) sulfide is common in secondary-school and first-year university syllabi. It links to neighbouring topics IV-VI semiconductors, Monosulfides, Reducing agents, so understanding it makes those chapters shorter.
In everyday life: Look for Tin(II) sulfide outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Tin(II) sulfide in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Tin(II) sulfide means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Tin(II) sulfide out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Tin(II) sulfide in simple terms?

Why does Tin(II) sulfide matter?

Because it connects several chemistry ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Tin(II) sulfide?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Tin(II) sulfide.